Roofing pie under the soft roof

The roof is a vital component of your home’s weather protection system. Its outer layers cover a crucial component called the roofing pie. This word describes the multilayered structure that acts as vital weather and moisture protection beneath soft roofing materials like tiles or shingles.

Under a soft roof, the roofing pie usually consists of multiple layers, each with a distinct function. The roof deck, also known as sheathing, is its central component and is often composed of OSB or plywood. This layer serves as a solid foundation for the roof’s structure, serving as the base upon which everything else is constructed.

An essential moisture barrier is the underlayment, which is located above the roof deck. This layer serves as an additional barrier, keeping water from penetrating the interior of the house and the roof structure. Because of their resilience and potent water-repelling properties, felt and synthetic membranes are frequently used to make underlayments.

The last layer is the roofing material itself, which is placed on top of the underlayment. The majority of people only see the outermost layer of roofing, which could be made of clay tiles, asphalt shingles, or another type of soft material. Not only does it make the house look better, but it also acts as the main barrier against wind, rain, sun, and snow.

Types of roofing pies for soft coatings

Soft coatings, which can be rolled or gunts, are installed on a variety of buildings and structures. It is common practice to use bitumen tiles for residential buildings. A particular kind of roofing material is chosen based on whether the attic will be residential (attic) or non-residential. Every variety has unique traits, methods of installation, and structural elements.

Types of roofing cakes, table.

The post will provide detailed instructions on how to make both kinds of pies for a soft roof.

Bitumen tile model and dimensions

Prices for various types and manufacturers of bitumen tiles

Bitumen tile

Warm roofing pie

A fairly intricate design, precise adherence to building codes and regulations, as well as the advice of soft roofing material manufacturers, are required during construction. Warm roofs enable you to add additional living space at a minimal cost by converting a cold attic into a warm attic.

Asphalt tile

However, the technology breach results in a notable reduction in the warm roof’s ability to shield heat, a worsening of the rooms’ microclimate indicators, and an increase in the risk of leaks, all of which have very detrimental effects. All the factors affecting the coating should be considered in order for the warm roofing cake to provide the necessary performance indicators.

1. Precipitation. The roof should not have leaks, installation technology depends on the angle of inclination of slopes. Another important point – you need to take measures to prevent the blow of snow into a subcutaneous space.
2. Dynamic loads. The roof is acted by constant (weight of roofing materials) and temporary (mass of installers, snow and winds) load. During the calculation of the rafter system and the selection of coating materials, you need to take into account the maximum load values ​​in the complex. Plus these indicators applies a special design reliability coefficient.

The impact of precipitation in the atmosphere

The attic rooms’ microclimate parameters ought to be constant and independent of outside factors. Heat energy losses and increased heat transfer are caused by a significant temperature differential between the outside air and the rooms. A warm roof with a complicated roofing pie is installed to lessen them.

Stable indicators describe the microclimate of the premises.

A warm cake is supported by multiple layers.

Steam -banker

It is mounted from the interior of the space and keeps the mineral wool from becoming wet. Vapor barriers can be made from inexpensive polyethylene film or more expensive, contemporary membranes. It is not necessary to install a vapor barrier if polystyrene or polystrene foam is used as a heater because these materials don’t absorb moisture, are unafraid of humidity, and don’t increase thermal conductivity depending on the relative humidity levels.

The difference in the partial pressure of the water vapor in the room and in the open air causes moisture penetration through the structure of the roof pie. The steam -banker must be made from materials with high strength and minimum vapor permeability, Due to this, the risks of penetration of wet air into the insulation are minimized. If vapor barrier is improperly made, then moisture condenses in the thickness of the cotton wool. This happens due to the fact that at low temperatures the maximum possible amount of water in a vapor-shaped state is much lower than at high temperatures. Condensate is formed in the upper layer of cotton wool, it is here that the dew point is located. But in the future, under the influence of gravity, the water drops down, due to such a movement, the entire layer of mineral wool gradually gets wet. The accumulated moisture in the structure not only reduces thermal protection, but also causes decay processes.

Prices for various types of vapor barrier membranes

Vapor barrier membrane

Insulation

Rolled or pressed mineral wool and foam are used. Mineral wool has two advantages: it does not burn and does not release harmful chemical compounds into the air. Disadvantages: high cost, high weight and negative reaction to moisture increase. To eliminate the shortcomings of the mineral wool, it is necessary to use additional materials and technologies, which significantly increases the estimate of a warm roofing pie. Polistyle foam is much easier and cheaper, special construction measures are not required to protect against moisture and wind. Disadvantages: plastic burns and selects chemical compounds. But modern types of polystyrene foam almost got rid of these shortcomings and are allowed by sanitary organizations to use without significant restrictions.

The building’s climate zone is taken into consideration when choosing the roof pie’s heat insulator thickness. In the event that fewer recommended standards are met, thermal insulation has the opposite effect, cooling the attic instead of insulating its premises. Why? Everything is really easy to understand. Mineral wool thin sheets absorb moisture quickly and multiply, increasing the heat transfer coefficient. Not to be overlooked are the detrimental effects that wet wool has on wooden structures.

An additional issue with an inadequately insulated roof. On roofing material, snow is heated by warm air. He is melting very quickly; big icicles are hanging from the roof. Take note of their abundance on older structures; this indicates that the buildings’ level of thermal protection is extremely low. These buildings’ owners purchase pricey energy to heat the streets. Icicles are obviously dangerous for onlookers. Remember that in the Moscow area, mineral wool should be at least 15 cm thick.

Comparative attributes of the roof insulation

Sensible guidance. It is not necessary to use rafters that are 15 cm wide for the majority of rafter systems because doing so is costly and unprofitable. What should be done if the insulation is thicker than the rafter boards’ width? The first layer of insulation must be laid across the width of the boards, and the final layer of insulation, which is five centimeters thick, must rest against the rails that are nailed across the rafters at a thickness of four to five centimeters. In addition, he will remove the cold’s bridges and shield the rafters from the elements at the same moment.

Prices for thermal insulation materials

Thermal insulation materials

Wind protection

Required when using mineral wool as a heating medium. The truth is that mineral wool blows easily, so if it isn’t shielded, heat escapes into the atmosphere and insulation effectiveness plummets. One more crucial need for wind protection is that it shouldn’t impede the moisture that has seeped into the mineral wool from evaporating. Steam can fall into cotton wool and condense there, so no matter how carefully the insulation is insulated, no one will guarantee a hundred percent against breakthroughs or violations of tightness.

The parodyffusion membrane is required for

This phenomenon has a negative side effect in addition to increasing heat conductivity: rot and fungi will eventually damage the wooden rafter structures when they come into prolonged contact with wet wool. Consequently, the rafter system eventually loses its initial signs of viciousness, the soft coating becomes severely deformed, and leaks occur. You will, at most, need to do an emergency roof repair. In the worst case scenario, replace the rafter system entirely and fix the interior.

Membranes for vapor and hydro barriers

Contact

Because of natural ventilation, moisture evaporating from mineral wool must be removed. The ventilated gap’s cross-section is chosen so that the amount of moist air removed and fresh air entering is equal. If not, the significance could rise sharply and lead to the development of steam condensation in a subcutaneous area.

The area of the ventilated gap must not be 1/500 of the slope’s area in order to guarantee the subcutaneous layer’s natural ventilation to function effectively. In any event, there should be a minimum of three centimeters between the coating and the control layer.

Continuous crate

Most frequently utilized glued plywood or OSP slabs. While choosing moisture-resistant slabs is advised, keep in mind that not all of them can tolerate prolonged direct exposure to water. They need to be given extra security.

Container

Lining carpet

The goal is to obtain more leak insurance. Furthermore, the lining carpet acts as an additional barrier against leaks for chimneys, ventilation conclusions, and other engineering communications. These locations are thought to be the riskiest since it is very challenging to keep them dry using just the soft coating’s surface.

Prices for carpets lining

The carpet is lining

Bitumen tile

Apply a final, moisture-resistant and decorative coating. The warm pie roof design is intricate and costly, as evidenced by the list of layers. Furthermore, any technological deviance can result in a significant roof renovation in addition to a rapid decline in heat-saving indicators.

Paint color scheme for asphalt tiles

Sensible guidance. Seek professional assistance if you lack any practical experience in producing construction work. Trying to handle everything yourself can end up costing a lot more money than hiring skilled builders to finish the job to a high standard.

The calculator of the attic

Requirements and features of the arrangement of a warm roof pie

Think about the most sophisticated technology used, for instance, to install a warm roof pie on a residential building’s pitched roof. It is important to keep in mind that roofs with soft tiles must have a minimum slope of 12 °.

Step 1. Attach vapor barrier to rafters, you can do this both from the inside and outside the room. To protect mineral wool from the steam, modern steam browning membranes are used, including foil. The material is of high quality, but quite expensive. It is much more profitable to use ordinary plastic film with a thickness of 20 microns. In terms of technical indicators, it is no different from modern materials, and at a cost is several times lower. There is another plus of the film – large sizes. In implementation, you can find three -meter sleeves of the film, after cutting the tape becomes a single width of six meters. Such large sizes reduce the number of joints, respectively, the tightness of the protection increases.

Important: All joints need to be sealed with tape; regular tape will do; don’t spend money on fancy ones.

Ten to fifteen centimeters should overlap.

The film’s floor is constructed with at least ten centimeters of overlap from top to bottom. Little cloves or a building stapler can be used to secure the material. The first option is better because it can be done faster and is a more reliable fastening method because only the clove with a hat is pressed by the brackets along the length of the film. The more dependable the insulation, the more comfortable the microclimate in the rooms, and the better the vapor barrier, the more cautiously you should perform this operation. That’s not all, though. Dry mineral wool prevents rot and fungus from growing on the wooden components of the rafter system.

Every joint has to be sealed as tightly as feasible.

Make sure the membrane overlaps the chimney’s surface during installation, and use a strong adhesive to seal any cracks.

Step 2: Create a crate inside the building beneath the insulation, place mineral wool on it, and then attach wall décor to it. Use boards or rails as casing; the space between them should not be greater than 40 cm; otherwise, the weight of the heavy mineral wool will cause it to flex over time. As a result, there will be more thermal losses and less density in the rafter sheets. It’s not necessary to use brand-new lumber for casing; you can use various non-unleasure or used materials instead. The primary requirement is that each element have the same thickness.

Insulation is provided by mineral wool.

Step 3: Get the insulation installed. Experience has shown that for the average climatic zone, the mineral wool layer should be at least 15 cm thick; otherwise, its effectiveness will be significantly diminished. The rationale behind this procedure is explained in the article above.

Plates of the necessary thickness can be laid in one layer right away, or two layers at a time. In order to reduce heat losses, a joint displacement is required in the second scenario. The mineral wool’s dimensions should be one to two centimeters larger than the space between the rafters. This parameter ought to be supplied during the rafter system’s design and construction phases. You will need to cut the thin mat strips and seal the cracks if the spacing between the rafters is not as specified. It’s a lengthy and fruitless process.

The process of laying mineral wool

Installing wind protection is step four. Only a contemporary membrane that allows steam to pass through but not water or wind should be used in this situation. During operation, there will be two issues if you break the rule.

1. Mineral wool will increase humidity due to condensate, the heat efficiency indicators will sharply worsen. Condensate appears due to the fact that it is impossible to completely eliminate steam from the inside of the room into thermal insulation, it can only be influenced by its number. The membrane must pass steam out of cotton wool, due to this, the appearance of condensate is excluded.
2. Minvata has a low density and is easily blown by the wind. Warm air will be removed along with it, and this further increases heat loss from the inside of the rooms.

The membrane has overflows in it.

In conclusion, only a specific parodyffusion membrane needs to be used for wind protection.

The packaging will specify which side of the membrane needs to be fixed, so pay attention to that. Starting at the bottom of the slope, roll the rolls in a direction parallel to the cornice. The material is fastened using a stapler; tape is not required; the joints are around 10 cm apart.

Stapler-assisted membrane fixation

Step 5. Natural ventilation device. The purpose of ventilation is to promptly remove moisture and avoid condensation on a continuous crate beneath a soft roof. It is advised to nail a 3 cm thick crate onto the rafter system to avoid having to perform intricate calculations. Only along the rafters do they need to be fixed; otherwise, the air supply and discharge will be obstructed.

Sensible guidance. It is advised to keep rail lengths between 1 and 1.5 meters and to leave gaps between them up to 10 centimeters long in order to improve ventilation reliability. As a result, multiple fictions are linked to a single system; in the event that one malfunctions, air is vented through the adjacent fiction. Expert builders highly advise using rails to impregnate antiseptics because they perform well even in the most challenging circumstances. It doesn’t really matter what brand of antiseptic you use—all of them work well enough. Avoid using antiseptics; instead, soak the slats in olifa or plain lean oil.

Make sure to leave these spaces

Make sure that the entrance holes are left in accordance with the cornice; on a linear meter, the holes’ area should be at least 200 cm2, and at the roof’s skate, the holes’ size should be at least 100 cm 2 per linear meter.

Step 6: Installing a continuous soft coatings crate. Although plywood is slightly more expensive, OSP is used for this purpose, as the article has already mentioned. It is recommended that you use 20 mm overlaid boards. Technically speaking, this option should survive, but it will be far more expensive. Nails or self-tapping screws are used to secure the slabs, with a 50–60 cm step.

Sturdy one-layer plywood or OSP crate

Sturdy, one-layer crate made of boards

Step 7: Put the lining beneath the pliable tile in place. It is essential to provide additional moisture protection for wooden structures, thereby enhancing their durability and operational safety. Stripes both vertical and horizontal can be nailed into the lining carpet. There isn’t much of a difference in the operational indicators, so pick the method that makes the most sense for you while keeping the slopes’ linear sizes and inclination angle in mind. It is much simpler to fix the vertical material strips if the angle of inclination is very large. Little cloves or a stapler can also be used to repair this roofing cake layer.

Starting with the cornice and moving along it, horizontal styling

The carpet is laid vertically.

Vital. It is customary to lay the lining carpet in the valleys first, followed by even sections of the roof. The proper overlap is provided by this arrangement, which also keeps leaks from developing in the roof’s most vulnerable areas.

Always start the carpet installation process with the apples.

Never trim extra carpet in areas with prefabricated roofs. In the event that such a technological requirement develops, place wooden boards or rails underneath it to shield the previously laid material from any gaps. Liquid bitumen or other contemporary mastics are guaranteed to lubricate the linings’ locations. For marketing purposes, a lot of manufacturers state that their soft coatings can be kept at a minimum of -5 °C below zero. It is accurate to say that soft coatings can be used at such temperatures. However, unnecessary. A responsible roofer would not handle such situations because he respects his reputation. It is only appropriate to install the soft roof in positive temperatures.

The carpet-laying procedure

Step 8: Install the cornice strips, overlapping them by approximately 5 cm. Place the lining carpet underneath them. Install the apple carpet.

Cornice bar installation

The strips are mounted with a five centimeter overlap.

Using two roofing nails to form joints

Yendy carpet to flexible tile color

Pruning the carpet made of apples

You can begin installing soft tiles as part of this roof pie installation project. Nothing is hard, the technology is standard. The most important thing is to follow current building regulations and not rush.

To ensure the longevity and effectiveness of your roof, it is essential to comprehend the roofing pie beneath a soft roof. This multi-layered construction is made up of multiple essential parts that work together to shield your house from the weather.

The decking creates the foundation from the bottom up, giving the entire roof a sturdy base. Furthermore, underlayment improves the roof’s waterproofing qualities by acting as a second line of defense against moisture.

The main attraction is the soft roofing material, which is typically composed of rubber membranes or asphalt shingles, and is placed above the underlayment. This layer is essential for protecting the roof from sunlight, precipitation, and snow in addition to its aesthetic value.

Appropriate insulation is included with the roofing system to increase longevity. Insulation lowers heating costs and promotes energy efficiency by preventing heat loss in addition to controlling indoor temperature.

You can extend the life of your soft roof by performing timely repairs and routine maintenance. By checking for damage, cleaning your gutters, and replacing worn-out components, you can keep your roof in excellent shape for many years to come and avoid expensive repairs.

Homeowners can ensure their home stays safe, comfortable, and weatherproof by making informed decisions about maintenance, repairs, and upgrades by knowing the make-up and significance of each layer in the roofing pie under a soft roof.

"Especially beneath pliable or soft roofing materials like tiles or shingles, roofing underlayment is essential for shielding your house from the weather. Often called the "roofing pie," this underlayment improves the overall longevity of your roof by preventing water infiltration and offering thermal insulation. A durable and effective roofing system requires an understanding of the layers involved, including vapor barriers, insulation, and waterproof membranes. This article examines how these elements cooperate to protect your house and provides helpful advice on selecting and installing the best underlayment for a soft roof.

Video on the topic

Preparation of a continuous basis for the installation of flexible tiles // Forumhouse

Waterproofing and a crate of the roof for flexible tiles. Building a house on the project "Abode of Angels"