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The roof of asbestos cement sheets

The roof of asbestos cement sheets

 

The roof of asbestos cement sheets device asbestos roof . Asbestos sheets are laid on the diagonal lap, from the bottom up, in the ranks of — from left to right or right to left. Eaves and razzheloba cover pre-prepared strips of steel roofing. In the front row are placed eaves edges of the sheet and attach the two nails 2,5h35 mm. The second and subsequent four rows begin with a half-sheet stacking, which strengthen nails and staples. All subsequent odd rows start with the installation of entire sheets, strengthens the two nails.

Starting from the third row of the bottom corners of each sheet is attached protivovetrovymi buttons. Before covering the ridge and ribs reinforce the ridge bars and Ruberoid tape. The latter lay, not blew the snow to the attic (see. Fig. 1). One of the main requirements for the installation of asbestos-cement sheets — properly break on the slopes of the grid with a pitch in the longitudinal direction — the slope of the roof — 255 mm, and a cross — along the eaves — 235 mm. Sheets can not nailing nails tight. Nail heads should only come into contact with the plane of the sheet. Otherwise, sheets or crack in windy vibrate. The roof of asbestos cement sheets do not require special care, the longevity of its 25 years and more. To extend the life it can be painted light and weatherproof oil paints and colored enamel PF-115, PF-133. For roofing silver added in the aluminum powder lacquer CHV-784 or GF-166 in an amount of 6 ... 10% by weight of the varnish. Attach sheets to the crate with nails, screws and staples partially protivovetrovymi. Operate with the roof battens so that it can be laid integer sheet in both the longitudinal and transverse directions.

Sheets are placed in parallel rows in a direction from one gable to another. Laying begin with a series of cornice and ridge end.

To eliminate the gaps in the transverse and longitudinal overlaps especially sheets and HC slaves are sealing mastic, such as Thiokol sealants AM 0.5; netverdeyuschaya sealing construction; UT-31 sealant. Mastic applied with a spatula on wooden overlapping the edges a strip width of 60 ... 70 layer thickness of 6 ... 7 mm, and then pressed slightly overlapping sheet.

Repair of asbestos-cement roofing. Asbestos cement roofing sheets have insufficient frost resistance due to the high porosity of asbestos-cement material during operation. On the surface, wetting sheets warp, losing strength. The service life of roofs 10 ... 15 years. The lifetime of asbestos roofing sheets can be increased significantly if the sheets are subjected to hydrophobization before laying, which leads to the formation at the material surface a thin hydrophobic layer to prevent surface wetting and penetration of water into the pores. As the water repellent used emulsion liquid NGL-94, as well as aqueous solutions NGL NGL-10 and-11.

To improve the water repellent protective film hydrophobizing composition is administered 1% aluminum stearate. The application of water-repellent solution to the asbestos cement sheets are stacked in the roof, should be carried out in a dry warm season on the cleaned surface by spraying, brushing or compressed air. Repellent surface does not require special care in the future. The use of asbestos cement sheets hydrophobic to reduce their water absorption at 3 ... 5 times with a corresponding increase in their hardiness. Lifetime repellent film is 5 ... 7 years, after which you want to re-hydrophobicity. In the absence of mechanical damage on the roof asbestos cement roof every 3 ... 4 years can be painted with oil paint liquid consistency. Sheets cracked or chipped replaced with new ones. The damaged leaves are removed so that the neighboring remained in place. The new sheet is placed two roofer. One lifts the loose side and top sheets, and the other, placing a new sheet on overlapping edges of adjacent, it moves in the direction of the ridge. When the lower edge of the new plate coincides with the edge of the row it is attached to the base. Broken or cracked replace tray

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