bitumen roofing felt

Bituminous roofing membranes represent a major portion of today's roofing and have a strong record of reliability. The waterproo

Construction Points]

Construction methods——hot melt, cold and hot adhering methods could be adopted to adhere sheets and substrates, or different sheets. While constructed with hot melt method, the thickness of membrane must be over 3mm; if constructed with cold adhering method, the thickness of cold adhesive must be 0.5~1mm.Substrate preparation——waterproofing substrates shall be flat, solid, and be dried sufficiently. Detail structures shall meet requirements of related stipulations and designs. Waterproofing layer——there are two kinds of structures of laminated and single layers, for laminated layers, thickness of each layer shall be not lower than 3mm, with complete adhesion between each other; for single layer, thickness of the single layer shall not be lower than 4mm. ·Overlapping——overlapping between sheets shall be completely adhered, with 80-100mm width of jointed area.·Vertical surface ends——fasten with metal battens and bolts, coat special sealant in all edges. Protection isolation layer construction——protection isolation layer shall be set on the exterior surface of waterproof layers according to related stipulations and designs, if use shale sheets or mineral grain coating surfaces as exposed waterproof layers, additional protective layer could be omitted; isolation layers shall be set between waterproof layers and rigid protective layers.  [Attentions for Construction]·Construction shall not be carried out in rain, snow or over 5 degree wind weather; ·There shall be sufficient safety protective facilities in construction site, place firefighting devices according to stipulations. Installation Sketch point Clean the substrate using broom or high pressure dusty cleaner. Apply primer  Heat the membrane bottom using a high temperature flame gun. Push forward while the primer and membrane oil melted Use a roller to push hard the membrane surface to ensure it stick firmly 

Technical data Confirming to GB18242-2008

No.	Item			I		II
				PY	G	PY	G	PYG
1	Soluble content/(g/m2)≥		3mm	2100
			4mm	2900
			5mm	3500
			Test		No flame		No flame
2	Heat resistance		°C	90		105
			≤mm	2
			Test	No flow, no dripping
3	Low temperature flexibility/°C			-20		-25
				No crack
4	Impermeability 30minutes			0.3MPa	0.2MPa	0.3MPa
5	Tension	Maximum/(N/50mm)		500	350	800	500	900
		Secondly-Maximum						800
		Test		No crack, no apart
6	Elongation	Maximum/%≥		30		40
		Secondly-Maximum≥						15
7	Oil Leaking	Pieces≤		2

bitumen roofing felt