Insulation of Mauerlat

Maintaining adequate insulation when it comes to roofing is essential for a cozy and energy-efficient house. The insulation of the Mauerlat, a crucial component where the roof structure meets the top of the walls, is one of the important components in this process. If not adequately insulated, this area is especially prone to heat loss, which over time could result in higher energy costs and structural problems.

The Mauerlat, sometimes referred to as the wall plate or sill, is essential for uniformly dispersing the weight of the roof over the building’s walls. It acts as a stable anchor point for the rafters or roof trusses. Not only is insulation crucial for energy efficiency, but it also keeps moisture from accumulating and reduces the risk of condensation-related damage.

A thermal barrier that keeps heat from escaping in the winter and keeps the interior cool in the summer is aided by the Mauerlat’s effective insulation. In addition to improving interior comfort, this thermal barrier makes a substantial annual contribution to lower heating and cooling expenses.

Depending on the climate, the amount of money available, and the particular roof design, there are a variety of insulation materials and techniques available for insulating the Mauerlat. For the insulation to function at its best and last for many years without losing its effectiveness, proper installation is essential.

High -quality Mauerlat device – reliable roof

In construction parlance, the rafters are referred to as the roof’s skeleton. The way the rafter system is installed will determine the roof’s shape and dependability. And the Mauerlat device was, and still is, the primary tool used in the rafter installation process.

Stated differently, the building’s perimeter is supported by logs that can support the roof and evenly distribute the weight it bears across the walls.

What is the power of the Mauerlat log?

Naturally, there are a plethora of options available for installing the rafter system, and each developer is free to select one of them, utilize the Mauerlat roof while building the roof, or forego it entirely.

However, after weighing the advantages and disadvantages, the majority decide to use Mauerlat logs. Why? The answer is clear: Mauerlat increases the rafter system’s rigidity by several orders of magnitude. The material is not consumed in this instance.

You still have an option, though, even if you are set on using the Mauerlat logs for the rafters: either make the "roof skeleton" toless-sprayed or with the expansion transmitted to the walls.

You must consider the subtle differences between the two options based on your needs and your capabilities for the future roof. You do, after all, live beneath it.

Therefore, the option is unutilized. On the one hand, this is a good thing because it eliminates the need to use additional force and time to fix the wall, as Mauerlat does not anticipate hard fixing in this situation (also known as "tightly"). The drawback is that you’ll have to fix the rafters right away because they’ll start to sway and become unstable.

The rafter structure can be stabilized with expansion, but this stability is dependent on how well the Mauerlat logs are consolidated.

Device. Process description

In the event that the house is constructed of wood, logs, or glued bars, the Mauerlat device procedure in this instance is quite straightforward and brief.

Simply placed along the upper crown of the walls and fastened as firmly as feasible are mauerlat logs.

The logs of the upper crown are occasionally found inside the chopped Mauerlat houses.

An entirely different, more labor-intensive method of fastening Mauerlat is with a brick house.

There are a number of different ways to use the device, but all of them require one thing in order to get started: deciding where to lay the Mauerlat and how to lay the log should be done at the wall-laying stage.

The amount of prep work required will vary depending on the fastening method selected.

  1. Wire tie method: when you have only three rows left before the top row of masonry, put the roller wire in the masonry and rush it into the wall. Follow the length of the wire: it should be enough for a reliable strapping of the beam.


When installing rafters and laying Mauerlat, insulation and waterproofing must be on the list of tasks to be completed in order to further prevent irksome issues like the deterioration of the logs and the entry of cold air through roof design gaps.

A devout developer would never place logs on an exposed wall. In addition to the mauserlates, the rafters’ sections that may come into contact with a monolithic belt also need to be isolated and folded into at least two layers.

This type of waterproofing has proven its worth and is regarded as the most dependable, long-lasting, and proven among developers.

It is equally important to have heat in your house while it is still being built. It is easy to estimate where heat can escape from heated rooms: if a tiny detail was missed during the Mauerlat bars’ installation and the Mauerlat area did not insulate the space, approximately 12% of the heat will escape through the roof.

And a few more tips

  1. Warming and waterproofing require a serious approach, because it is on the quality of these works that the durability of the roof and heat in the house depends, and the installation quality must be checked in the process, otherwise there is a risk of repairing the roof in the first year of operation.

You must carefully approach the Mauerlat device, which serves as the roof’s "foundation," to ensure that it does not move (in the true sense of the word).

Without losses: the fight against the bridges of the cold in the design of the attic roof

  1. Firstly, they reduce the efficiency of the thermal protection of the building, which is why the energy consumption for heating increases, which, in turn, turns into an increase in the cost of operating the house.
  2. Secondly, in the cold season, condensate accumulates in the freezing zone, which leads to getting wet and gradual damage to thermal insulation used to warm the roof (which is why the thermal protection of the building is also worsened).
  3. Thirdly, due to condensate can be covered with mold, rot and over time collapse wooden roof structures. Often condensate causes deformation of the decoration of the attic.
  4. Finally, fourthly, condensate in winter can freeze and break the cracks and gaps that he filled.

Errors during insulation

The most popular method of building an attic roof is to insulate slopes.

  1. The insulation is installed between the rafters, closing it from the side of the room with a vapor barrier film, and from the side of the street – a hydraulic protection vapor -permeable membrane.
  2. On top of hydraulic protection, they provide a gap with the possibility of air flow on the cornice overhang and its hood – in the area of ​​the skate.

Venturezor and films are two protective measures against moisturizing insulation. Either outdoor moisture (from leaks or precipitation blown off by the wind through the joints of small-piece roofing) or water steam (primarily falling into the under-trotted space from the inside of the building). Ultimately, as was previously indicated, the wet insulation gradually loses its ability to act as a thermal barrier. Thus, its moisture must be prevented.

On the left, insulating slabs are positioned in the rafters’ gaps. Correct: a top layer of insulation covering the rafters.

Erroneously removed through the outer walls, the metal skate run turns into a bridge of the cold.

  • To avoid gaps, it is necessary The width of the insulation slab was 10-20 mm larger than the width.
  • Installing the material of the dispersal, its Squeeze, which provides a dense fit to the rafter legs. However, the geometry of rafter legs is rarely ideal, and therefore a number of specialists recommends a more dense adjustment of the insulation to them cut each plate diagonallyand put it so that the upper part is slightly shifted down relative to the lower for better seal.
  • If the gaps were made during the installation of the insulation, then they should be Fill with fragments from the same thermal insulation material.
  • In addition, experts recommend make a contour of the roof insulation multilayer. For example, the circuit with a thickness of 150 mm is formed from three plates of 50 mm, so that the plate of the upper layer overlaps the joint of the bottom plates, thereby preventing the movement of cold air through the joints.

By integrating non-woven material insulation into a waterproofing membrane, it is feasible to achieve thermal insulation at the point where the roof and pediment meet.

It is very difficult to quickly isolate those places of the roof where you have to cut the slabs: in the areas, ridges, adjoining. It is necessary to cut the slabs of the required shape and with a margin in size, carefully compiling them during installation. According to many roofers, even with qualified work, it is not always possible to prevent the appearance of cold bridges in these areas of the roof. Solution – create an additional layer of thermal insulation, which would blocked possible places of freezing. The easiest option for such isolation is to fix the foil of foil of foamed polyethylene to the rafters from the premises of the sheet of the sheet.

It is very challenging to locate on the roof the areas that require slab cutting quickly.

“In order to exclude cold bridges in multi -layer (insulated) enclosing structures, it is necessary to create a closed thermal insulation circuit around the perimeter of the building. However, it is often very difficult to do this in practice. For example, a problem place is the Mauerlat zone – a bar on which rafter legs rest. The correct constructive solution of this node and the thoughtful procedure for the performance of insulation work is required so that the joint of roofing thermal insulation and wall is continuous. In addition, cold bridges arise due to a loose fit of insulation plates to each other and building structures. Therefore, when laying the plates between the rafters, it is necessary that the width of the insulation is about 10-30 mm more than the distance between the beams – then it will fit tightly to them. And when it is required to cut the insulation (in yendov, ridges, adjacents), cut the plates with a margin on each side. The gaps allowed during the installation of the slabs are defended by the same material. ".

Insulation within the zone of Mauerlat

Mauerlat (colored highlight).

  1. You can carry out work only in good weather and in daylight hours;
  2. It is necessary to close the insulation with a protective coating at the end of the day and remove it the next day (and working time is spent on this).

Therefore, when a hydraulic protection membrane (or a fully installed roof) is already placed on top of the rafters, roofers typically choose to install the insulation from within the room. In this instance, the work is completed more efficiently and the insulation’s protection from precipitation is assured. Putting the insulation in the space behind the Mauerlat is challenging, though, if the hydraulic protection membrane is already stuck (it must be pushed into the space between the membrane and the Mauerlat). Thus, there’s a good chance of freezing in this area. Experts advise working in the following order as a result:

  1. Even before the installation of hydraulic protection, lay the insulation in the space in front of the Mauerlat (from the side of the street) and above it to the height of the rafter legs – throughout the facade.
  2. Then lay the hydraulic protection membrane.
  3. And then insulate the rest of the slope.
  4. If the weather conditions do not allow this and the hydraulic protection is already fulfilled, then you can temporarily dismantle the control of the counter, raise the membrane, lay the insulation plates in the Mauerlat zone, and then fix the membrane again.

SKIF’s General Director, Konstantin Simonov:

“In order to prevent freezing of the roof, it is important to observe the correct sequence of work on its insulation in complex areas. So, in the Mauerlat zone (support for rafters) it is necessary to lay thermal insulation even before the installation of hydraulic protection and roofing material. If the hydraulic protection film is already laid, then the roofers will have to push the slabs into the gap between the Mauerlat and the film. And then, firstly, it is extremely difficult to qualitatively insulate the entire space behind the Mauerlat, and secondly, there is a danger of filling the gap between the beam and film with too large a layer of insulation, and it will block the nasal venturezor necessary to ventilate the roof structure. A similar situation with insulation in the pediment zone. Thus, you must first qualitatively lay the thermal insulation in those places that will be difficult to access after the installation of hydraulic protection, and only then lay the film ”.

  1. Root leg.
  2. Facing.
  3. Wall insulation circuit.
  4. Bearing wall.
  5. Mauerlat.
  6. Roof insulation circuit.
  7. Additional circuit insulation circuit.

Roofers also observe this subtlety: there are typically irregularities at the base where the wooden beams, or Mauerlat, are laid. You need to fill them with a low-thermal conductivity material (rather than a "cold" cement-sand mortar, as is commonly done), like mounting foam, to prevent them from becoming the bridges of the cold.

“At the junction of the roof with the pediment of the building, the probability of freezing is very likely. To prevent it in the West, there are special P-shaped elements from extruded polystyrene foam, which are “put on” on the front-ton wall. Our market has special diffusion hydraulic protection membranes with an integrated layer of insulation 30 mm thick from non -woven material: they can also protect this area from freezing. However, the traditional solution is to fill with mineral thermal insulation the space between the extreme rafter beam and the pediment wall (usually about 50 mm), the gap between the upper surface of the wall and the hydro -plate film, as well as lay the insulation along the upper edge of the wall. As a result, a continuous thermal insulation circuit is created, which closes the pediment and carrying the dew point inside the wall, thereby excludes the possibility of condensation in the thickness of the roof insulation ”.

There is a high likelihood of freezing at the point where the roof meets the building’s pediment.

  1. The first difficulty is that often on the entire upper part of the inclined pediment wall there are ledges formed due to masonry (from bricks, blocks). To level the wall, a “cold” cement-sand solution is often used, which becomes a bridge of the cold. It is better to use a "warm" solution with the addition of perlite instead. Or fill out irregularities in thermal insulation.
  2. The second difficulty is to warm this place qualitatively. It is necessary to leave a distance of at least 50 mm between the rafter leg and the pediment closest to the pediment, filling this space with thermal insulation. In addition, it is desirable that the upper plane of the wall is 50 mm below the upper plane of the rafter legs, and then the insulation is also laid on top of the wall to the height of the leg, ensuring its dense fit to insulation along the rafters. If possible, the insulation also mounts along its edge from the side of the street – a layer with a thickness equal to the thickness of the insulation on the slope of the roof.

Both extruded polystyrene foam and fibrous thermal insulation can be used in this situation. For the same reasons that we discussed briefly above, it is preferable to place the insulation on top of the pediment even before installing the hydro-protection membrane.

Freezing through the rafters

By obstructing potential cold bridges with an extra layer of insulation on the roof, heat loss can be effectively avoided.

1. It is inevitable that you will need to cut the heater slabs on complex configuration roofs in order to place them in the space between the rafters.

2. Attaching the film vapor barrier to the rafter leg.

3. Laying a slab that has been cut in the ridge zone.

4. Pieces of the same thermal insulation material gnaw their way through the cracks in an insulation layer.

Tanning window, smoke pipe

Smoke pipe and tanning window

This is frequently the result of the insulation layer being absent or being too thin on slopes and around the window frame.

“Among the reasons for freezing in the area of ​​the attic window is the lack of thermal insulation around the perimeter of the window box. Often this is caused by too small mounting gaps between the box and rafters. A gap of at least 30 mm should be left around the perimeter of the frame, installing either a finished heat -insulating circuit made of foamed polyethylene or a fibrous insulation around it. It is impossible to use the mounting foam for these purposes: it is inelastic and under the influence of periodic loads (roof precipitation, snow, wind load) crumbles, as a result of which the cracks in thermal insulation appear in thermal insulation. If the window width is equal to the width of the inter -trial opening or exceeds it, then to ensure the necessary installation gaps around the frame, you will have to adjust the rafters, maintaining their bearing capacity. Sometimes this can be done without a special calculation according to the schemes specified in the instructions for the installation of windows. This usually involves the installation of an additional beam, the cross -section of which coincides with the cross section of the rafter leg. ".

Pipes, antennas, and flagpoles are examples of passing elements that are thermally included into the roof design.

“Make the attic as comfortable as possible for living and ensuring the durability of the roof structure allows the creation of an additional circuit of insulation. The fact is that wooden supporting elements of the roof are to some extent the bridges of the cold. In addition, according to the calculations, the thermal insulation layer in the central part of Russia should be 200 mm, but the thickness of the most popular beams used for the construction of the rafters is 150 mm (and the insulation is laid in the interspolary space). Thus, it makes sense to create an additional thermal insulation layer that will provide the required thickness of the insulation and block the cold bridges that go through the rafters. This layer can be placed above and under the rafters, laying the insulation between the bars nailed across the rafters. Thermal insulation above the rafters is preferable, because in this case they do not freeze ".

An extra coating of insulation

  1. They stuff the rafters of wooden bars of the required cross section, between which the insulation plates are installed.
  2. A hydro -plane membrane is laid on top of the bars.
  3. The counter is fixed on it, a crate or continuous flooring, and on them – roofing material.

Given that the entire rafter structure will be in the "warm" zone, this option is effective in terms of thermal protection. But he is not without shortcomings:

  • Roof fixation to the base is less reliable due to additional wooden.
  • In addition, with the installation of hydraulic protection, the joints of the paintings can be on the insulation (and not on a wooden base), and the editors will push the film, moving along the roof.

Thus, additional insulation under the rafters is the best technology. In this instance, thermal insulation is placed between the transverse bars that connect the room to the rafters, and the space is then sealed with an attic vapor barrier and finishing materials.

Extra circuit of insulation beneath the rafters:

1. The root leg.

2. An extra circuit for insulation.

3. The block that runs transverse.

4. Rapard comes to an end.

We want to mention one more thing. Modern techniques for identifying cold bridges, such as thermal imaging or thermometer examination, will aid in the battle against freezing the roof. Purchasing or leasing these appliances won’t cost as much as fixing a frozen roof.

Insulation types for pitched roofs

  • In our market, stone fiber materials are represented by Rockwool (Denmark), Paroc (Finland), Nobasil (Slovakia), Technonikol, ISOROC, KNAUF (all – Russia) and others.
  • Glass heaters are offered by ISOVER (France), URSA (Spain), etc.

Materials made of polyurethane or extruded polystyrene foam have excellent heat-insulating qualities, but Polystyrene foam is classified as a strong-combed material (G4), while polyurethane foam is classified as a moderately or low-growing material (G2-G3). Both materials are not fireproof. Furthermore, fibrous heaters don’t catch fire (NG).

The portions of the building’s enclosing structures known as "cold bridges" are where the majority of heat losses take place, which has a number of detrimental effects.

Maintaining structural integrity and energy efficiency in buildings requires insulating the mauerlat. Adequate insulation keeps heat from escaping through the roof, which lowers energy costs and keeps the interior temperature cozy all year round. It serves as a barrier, reducing the amount of heat that is transferred from the building’s exterior to inside.

To get the best results, selecting the appropriate insulation material is essential. The effectiveness of materials like mineral wool, foam boards, and spray foam makes them popular choices for thermal insulation. While choosing the right insulation for mauerlat, factors like R-value, moisture resistance, and ease of installation should be taken into account.

It’s important to pay close attention to detail when installing insulation around the mauerlat. To stop air leaks, it entails putting the insulation material firmly between the roof rafters and making sure the seal is tight. In addition to increasing energy efficiency, proper installation reduces the possibility of moisture buildup and structural damage, extending the life of the roof structure.

To sum up, mauerlat insulation is an essential first step toward raising a building’s overall energy efficiency and comfort level. It keeps interior temperatures constant, minimizes heat loss, and lowers heating and cooling expenses. Long-term energy savings and structural durability can be achieved by homeowners and builders who invest in high-quality insulation and ensure proper installation.

"Adequate insulation of the mauerlat, the pivotal point of contact between walls and the roof structure, is crucial to guaranteeing the longevity and efficiency of a roof. This article examines the importance of mauerlat insulation and describes how it works to stop moisture and heat bridges. Homeowners and builders can improve energy efficiency and prevent structural damage to their properties by making educated decisions by knowing the significance of this frequently disregarded component."

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Alexander Sorokin

The owner of the roofing company, an expert in the roofing markets. I'll tell you about the novelties of the roofing industry and help you choose the best option for your home.

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