Dermabit 4250(3250,5250) is an ultra high performing roofing and waterproofing membrane, reinforced with a core of non woven polyester of 250g/m2 nominal weight, Suitable for a variety of applications mainly those featuring high dynamic movements in anti earthquake structural foundations, two layer conventional or exposed roofs, reservoirs, water retaining structures and precast, metal or wooden decks.
Features:
- Positive barrier to water and dampness.
- Ultra resistance to ageing and atmospheric agents.
- Remains flexible at low temperatures.
- maintains shape stability at high temperatures.
- Specially conceived to accommodate structural movements
- Withstands thermal shock and can be left exposed if coated with a reflective coat.
- Can be provided with a lap line
- May be torched directly over old shingles or old bituminous membranes.
- The top surface is covered with either fine sand, a thin polyethylene film (PBS) or natural Slates on cap sheets.
- The bottom surface is covered with a thin easy torched poly-Ethylene Film(a sand bottom is also available on request).
- Resistant to water- borne chemical attack.
Coating mixture of the membrane:
The proofing capability is provided by the coating mix of the dermabit membrane. The reinforcement made of nominal 250g/m2 non woven polyester mat is impregnated with this mix and then coated to factory regulated thickness. The mix is made up of bitumen, heavily modified with Amorphous poly- olefins, thermoplastic resins and stabilizers giving the membrane its excellent resistance to atmospheric agents and ageing, maintaining shape stability at high tenperatures, improving adhesion strength and making the membrane easy to apply saving on time and labor.
Packing:
It is manufactured in a standard size of 1x10m, however special length can be done on request. All rolls are sold on pallets and covered with a shrink-wrap.
