Waterproofing of the roof under the metal roofing - how to choose the material and to make installation

Protection garret (attic) room from moisture penetration from the outside is done in any case, regardless of the option selected finishing top of the structure and installation technology.The range of materials for waterproofing impressive, but whether they are suitable, if the roof is covered with metal tile?

To avoid further trouble, and not waste time on a point or major repairs, you should know the product selection criteria and the specifics of the waterproofing of the roof under the metal.But with this in detail and we will understand.

General (protective) function of waterproofing products remains unchanged.But the metal as a roofing material has its own peculiarity.Its basis - the steel sheet, therefore, at constant (of daily) variations in temperature inevitably the formation of condensate, and on the inner side of the samples.It further "way" is known - heating material and structural elements (this timber and timber products on its basis) truss system.

General installation scheme (layout) waterproofing metal roofing shown.Nothing complicated, in principle, no.But it is common.

design

truss system mainly concerns such a question, as the natural ventilation of roof space.For whatever scheme it is organized, how effective - quite a lot of nuances, and they need to be thought out at the design stage.

complexity of installation

work on the roof of operations - from the category of "high-rise", therefore, one of the first places raises a criterion of durability waterproofing layer.Traditional materials, such as asphalt, roofing material, "under the metal" is clearly not appropriate.Even under ideal conditions of their working life does not exceed 4 years.But the fact of the destruction process starts much earlier (depending on local conditions).

For laying under the metal roofing is the only option - the membrane.Species such multiple film materials - on the structure, the manufacturer, application conditions, flame resistance and so on, but they provide a reliable protection from moisture structural elements disposed beneath the metal roofing.

Types of waterproofing coatings

Technology laying membranes (films)

waterproofing layer The location has already been shown in the figures - by kontrobreshetkoy on which metal sheets are fixed.Here's another:

height strips of additional supporting framework regulated the intensity of natural ventilation.This linear parameter is calculated in advance in the design of roof system.

mounting Features waterproofing layer

Unrolling roll can be made as a ridge parallel to the span, and perpendicular (from it - down).In the first case, the minimum overlap bands - 100 mm, in the second - greater (up to 150).

mount to the main supporting framework (crate) - staples staple gun.In some cases, allowed to use nails, but only of stainless steel and large caps (to avoid the risk of rupture of the material).And it must be provided with a small membrane slack thermal strain case.Its value is determined by the spacing between the rails crates or rafters.On average - about 20 mm.

in places of contact with vertical structures (stove, sewage pipes and the like) film should go to them not less than 50 mm.

All of the above - a total specifics of working with waterproofing membranes.All nuances are reflected in the instructions for a particular sample, so installation should start only after careful consideration of all the recommendations of the manufacturer.