The torch on method of installing roofing felt uses the heat from a purpose made roofing gas torch.
A full and continuous bond is achieved by directing the torch on the face of the roll of membrane until molten coating runs down to form a continuous flow in front of the roll. The torch on material is rolled forward into the flow of bitumen while the torching operation continues. This allows the torch on the membrane to achieve continuous bonding, and the flow of bitumen ensures that air is not trapped under the roofing material. When correctly applied, a small bead of bitumen (approximately 5-15mm) should appear from under the lap and is a good indication that the material is bonded.
The self-adhesive method of installing roofing felt is a flame free built up roofing technique which does not require the use of hot bitumen or gas torches. It is a quick and clean method with minimum surface disruption during laying.
Bonding is achieved instantly due to the interaction between the adhesive formulation of the coatings used in the membranes and specialist primers that promote low-temperature bonding.
PolyGlass single layer roofing system can be mechanically fastened, ballasted or bonded with polyurethane adhesive. The membrane may be used on either insulation or uninsulated roofs in conjunction with the other PolyGlass products.
This single layer system consists of a bituminous membrane; heat activated detailing membrane and a self-adhesive vapour control layer, insulation and a range of pre-formed metal details. This system has been independently approved.
When combined with the heat activated vapour control layer and a heat activated detailing membrane to form a completely flame free roofing system.
This PolyGlass system comes with a 20-year guarantee that covers materials, design and workmanship, when installed by a PolyGlass approved contractor.
Liquid applied roofing systems have significant advantages. They are seamless, provide a lasting barrier to water penetration, do not embrittle and are highly resistant to sunlight.
Liquid Applied Roofing is suitable for warm or cold roofs whether the roof is flat, inverted, green or profiled/pitched.
They are applied by brush, roller or spray and are easily moulded around upstands and other awkward areas.
When used in upgrading work, it is not always necessary to strip away existing failed roofing materials. So there is no need to protect the building while the roof is exposed to the elements and there is no disruption to normal routines carried out within the building.
Liquid Applied Roofing comes with a 5, 10, 15 or 20-year guarantee that covers materials, design and workmanship via a PolyGlass specification when installed by an approved PolyGlass contractor.
The choice of insulation for flat roofs is an essential aspect of the specification and it is important to ensure the insulation is compatible with the roofing membranes.
PolyGlass Waterproofing has a wide range of insulations to suit your needs, whether you are using pour & roll or torch on, cold applied, flame free or liquid applications. It is desirable to insulate a roof to minimise both heat loss and heat gain.
The Building Regulations Part L Conservation of fuel and power state a minimum U value for a building as U-value requirement 0.25 Wm2/K.
To reduce heat loss from a building, it is necessary to provide insulation within the roof build up, to meet the current building regulations. BS 6229 and BS 5250 give specific guidance on calculating condensation risk within a structure. Interstitial condensation can occur within the insulation, but this can be eliminated in most cases by the inclusion of a vapour control layer in the design.
PIR Foam Insulation Board
PIR foam insulations can be utilised very easily into all of PolyGlass Waterproofing’s Cold Applied, Liquid Applied, Flame Free & Pour & Roll systems. Within Cold Applied, Liquid Applied & Self Adhesive systems the insulation can be bonded in adhesive, with the waterproofing system also being applied without the need for hot bitumen &/or naked flame. PIR foam insulations are available in various thicknesses and also as bespoke tapered schemes to suit specific roof scenarios and improve existing falls upon the roof. Where resistance to wind uplift is of paramount importance, it is recommended that a composite insulation is used to permit full bonding of the membrane (see next section)
Composite Insulation Board
Composite insulation board is used for full bonding of the waterproofing membranes. Specified to be used in conjunction with pour & roll, torch-on and cold applied, self-adhesive waterproofing systems. PolyGlass Waterproofing offers a range of composite insulation to suite specific waterproofing applications such as cork topping (for pour & roll), perlite topping (for torch-on) and recovery boards (for self-adhesive). Composite insulations are available in various thicknesses and also as bespoke tapered schemes to suit specific roof scenarios and improve existing falls upon the roof.
Foil Faced Insulation Board
Foil-faced insulation board is specified for use with cold applied or mechanically fastened roofing applications. Foil faced insulations are available in various thicknesses and also as bespoke tapered schemes to suit specific roof scenarios and improve existing falls upon the roof.
Torch-on Insulation Board
Torch-on insulation board is specifically for torch-on application. It has good sound and thermal roof criteria and good fire resistance. Torch-on insulations are available in various thicknesses and also as bespoke tapered schemes to suit specific roof scenarios and improve existing falls upon the roof.