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Synthetic Roofing Underlayment Technical Requirements

Jul 03, 2017

Generally using cement mortar, fine stone concrete or asphalt mortar as the overall leveling layer of roofing.


1 Thickness and technical requirements

Shan Cement Mortar Leveling layer: When the structural layer is cast-in-place concrete monolithic slab, the thickness is 15 20mm, when the whole or block material insulation layer, the thickness is 20 25mm, Synthetic Roofing Underlayment when the structural layer is the assembled concrete slab and the insulating layer is loose material, the thickness is 20 30mm.

Cement mortar uses 1:2.5 ~ 1:3 (Cement: Sand) volume ratio, Synthetic Roofing Underlayment cement strength level is not less than 32.5.

Shan Fine Stone Concrete leveling layer: thickness is 30, concrete strength grade is not less than C20.

Shan Asphalt Mortar Leveling layer: When the structural layer is cast-in-place concrete monolithic slab, the thickness is 15 20mm, when the structural layer is assembled concrete slab and the insulating layer is whole or block material, the thickness is 20 25mm. Asphalt mortar used 1:8 (asphalt: Sand) quality ratio.


2 Leveling Layer Drainage slope

The flat roof uses the structure to find the slope should not be less than 3%, the material finds the slope to be 2%; gutter, eaves ditch longitudinal slope should not be less than 1%, Synthetic Roofing Underlayment ditch bottom water should not exceed 200mm.


3 node Processing

Leveling layer in the prominent roof structure (daughter Wall, Gable, deformed seam, chimney) at the junction and corner should be made into a garden arc, the radius of the garden when the waterproof layer for asphalt waterproof roll material when R 100, polymer modified asphalt waterproofing membrane Ry 50mm, synthetic polymer waterproofing membrane when R 20mm. The internal drainage of the mouth around the water, Synthetic Roofing Underlayment leveling layer should be made slightly lower pits.

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High and low cross deformation seam treatment:

Leveling layer should be slotted, and embedded sealing material. The slot should be left in the end seam of the plate, the maximum spacing between the longitudinal and transverse joints, Synthetic Roofing Underlayment cement mortar or fine stone concrete leveling layer should not be greater than 6m, asphalt mortar should not be greater than 4m.


1 Insulating layer Material

Thermal insulation materials can be divided into three categories: first, loose materials, such as slag, expanded vermiculite, expanded perlite, and so on, has been less used. The second is the plate-like material, such as expanded vermiculite, expanded perlite block, foam cement, Synthetic Roofing Underlayment aerated concrete block, rock Wool Board, EPS poly-Stupid board, XPS extruded Plastic board. The third is the whole casting (spray) insulation layer, such as asphalt expansion vermiculite, asphalt expansion perlite, polyurethane foam waterproof insulation system.

At present, more use is the Rock Wool Board, EPS poly-Stupid board, XPS extruded plate and other plate materials. Polyurethane foam waterproof insulation and other integrated systems developed rapidly.


2 Insulation Layer Construction

Insulation layer before the construction of the grass-roots should be flat, Synthetic Roofing Underlayment dry and clean, insulation board close (rely on) grass-roots, paving pad stability, layering seam staggered, seam tight, the gap between the plate should be used in the same type of material embedded dense, Synthetic Roofing Underlayment paste should be affixed to strict adhesion, find the correct slope


Rock Wool Board insulation layer laying:

The use of high-pressure airless spraying machine on-site direct foaming molding process, so that the integration of roof waterproof insulation, the formation of waterproof insulation layer continuously without seams, with excellent insulation effect, good adhesion performance, high strength, strong resistance to permeability and anti-aging performance and other characteristics.