Tuesday, August 9, 2011

Insulation and vapor barrier roofing

Q: What is the insulation of the roof technology?

A: Thermal insulation, roof construction should be carried out in accordance with applicable building codes. On the roof of the attic is insulated from the cold attic ceiling only. At first, it settles on vapor barrier from vapor tight material (felt, asphalt, roofing felt, waterproofing, borulin, tectonic, steklogidroizol, etc.). Vapor barrier is placed on a layer of insulation.

By insulant usually arranged screed of cement-sand mortar with thickness of 20-30 mm, and it fit running boards.

Q: Is the roof insulated foam polystyrene plates?

Answer: There are many different technologies such warmth. Here is one: you first need to lay a vapor barrier layer (asphalt, n / o film) on it - polystyrene plate. From the top to make a cement-sand screed thickness from 30 to 50 mm. And, in conclusion, to make waterproof.

Q: Can I use for warming the attic floor cottage polystyrene plates?

A: Yes. At the pre-made in the space between the beams and vapor control layer should be laid slabs of expanded polystyrene. If the insulation is a two-layer, for better sealing of the joints should shift. The insulating layer is fixed or sliding fence filled clay pellets.

Q: How are stacked polystyrene plates on a sloping roof?

A: Plates should be inserted back to back. And to fill the rafters to create the thrust rods ventilated cavity between the insulation and roofing. Thermal insulation would be better if the plates laid in 2 layers with offset joints.

Q: Why do experts recommend warming the roof over the attic reflective thermal insulator?

A: Thermal insulation, roofing, tend to perform mineral wool insulation 150 mm thick, protected lower vapor barrier material, and the upper under-roof waterproofing. This combination of materials is well protected insulating layer, allowing him a long time to stay dry and safe.

But such insulation is not quite meet the modern requirements and needs to be enhanced thermal protective qualities. Building insulation leads to a massive increase, which is not always possible to design features of the roof. Especially as the traditional insulation layer stops only 85% of the energy loss through heat transfer and convection. The second layer of additional insulation stops only 12% that missed the first. After all, the traditional insulation follows the law to reduce - the more layers of insulation is applied, the less energy loss followed by constrained layer.

In such cases, irreplaceable reflective thermal insulator, for example, penofol.

Q: How does insulation roofing penofolom?

Answer: The material is installed inside the wooden elements of truss construction. To consolidate the use of construction stapler or small nails. Assembly joints and possible damage to the material glued aluminum duct tape to create a reliable vapor barrier system. Headliner performing lining, plasterboard or plastic panels. To achieve the greatest effect is necessary to provide a small air gap between the surface penofola covered with aluminum foil, and near the structure. This will ensure maximum results from the use of "heat mirror".

Question: What to do if on the flat roof is wetting and freezing insulation layer?

Answer: You need to correct a violation of vapor barrier. To do this, opened roofing over the damaged areas. Removable buckle and insulation layer. Dried damaged area and heat-insulating material. Corrected or okleechnoy obmazochnoy vapor barrier in accordance with the requirements of the project. Then reduced insulating layer, screed and roofing. Incisions roof membrane is sealed in 2 layers of strips of rolled material, overlapping them by 100 mm.

Q: Why is formed on the flat roof dents, creases and cracks over the joints of insulation boards?

Answer: There are many reasons:

shrinkage or swelling of the organic insulating material;

insulating foam deformation and other materials, arranged without the necessary exposure after fabrication;

damage to corners and edges insulating material;

vibration load-bearing structures of a flat cover, especially flooring, low flexural rigidity (boardwalk, decking boards made of chipboard).

To eliminate damage to the roof to clear the area at the site of formation of folds and fissures. Fill the gap insulating material. Fill the sand-cement mortar. Primary coated. Paste over the surface of rolled material. Smear the surface with hot asphalt cement and gravel.

Q: How can I fix through cracks in the layers of waterproofing carpet laid on the plate heat insulation?

Answer: The damage occurred because of slack water shutoff carpet because of the large gaps between the slabs of insulation, as well as oblique angles.

For the repair needed:

along the cracks of a width of 1 m free waterproofing carpet from the protective layer or coarse spreading;

bend for ease of layers of roofing material, located above the crack;

fill in the seams of the strips insulation;

stick bent layers of roofing materials;

on crack to put a strip of rolled material width 150 - 200 mm, and glue it to one side of the crack from the top layer of waterproofing mat;

produce a continuous three-label and on the roofs, filled with water four panels of roofing materials, so that each top panel overlaps the underlying and glued lap with the main water shutoff carpet for 100 - 150 mm on each side of the crack;

perform a protective layer or Paint coarse grit.

Q: As a result the soft roof of the air appear "bags" of more than 1 m in diameter?

A: This happens because of deficient vapor barrier. Water vapor along with heat flow rises and diffuses through the attic floor. If couples do not encounter obstacles in their path, they are cooled, condensed.

In winter, water-logged insulation material in conditions of frequent thaws repeatedly freezes and thaws. The presence of moisture in the thickness of insulation leads to the destruction of roof membrane, because at low temperatures under it collects moisture, which eventually turns into a block of ice. Freezing, the water pulls the carpet from the base of roof and increases the pores in the roofing material. In the summer, when the temperature of the outer surface of the roof 80 °, a drop of moisture, which is in a confined space turned into steam and can grow in volume by 15 - 40 times, so the formation of air pockets, which reach more than 1 m in diameter.


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