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Butynol

Butynol Rubber membrane for flat roofs.


We repair and install butynol roofing membrane to the Wellington, Lower Hutt and Upper Hutt region. Butynol roofing is very durable and in many cases can be repaired, without the need to re-roof.
 
Butynol roofing membrane is a synthetic rubber sheet, used to protect flat roof structures. Butynol is an extremly robust roof covering that remains flexible throughout its useable life. The membrane resists stresses from sunlight, heat and cold temperatures. In fact, butynol roofing membrane is so watertight it is used to line ponds and water tanks.

Why Choose Butynol?


Butynol rubber roofing membrane is the number one choice for low pitched roofs in New Zealand.  The test for any roof covering, is how it performs on the roof after many years of weathering. Butynol roofing has proved to be a robust and durable waterproof covering, which outlasts all other flat roofing membranes. The rubber membrane is extremly flexible and able to withstand high temperature fluctuations. It has also proved to be one of the most wind resistant roofing membranes available, making it ideal for Wellingtons climate.
 Unlike other flat roof materials, Butynol is laid single ply, which adds to its flexibility.  The rubber membrane is constructed by joining petroleum gases isobutylene with isoprene under extreme low temperatures.  


Laying Butynol.


If you plan to lay your own butynol, here are a few tips that will make the installation easier. The advice is for a small basic flat roof with no joins, up stands, outlets, hoppers or complicated roof detail.  Any roof detail other than a basic slab, should be left to a trained applicator.  
It is important that the Butynol roofing sheet is laid on a sound substructure with enough fall to provide sufficient drainage. For the majority of residential roofs, plywood of 18mm thickness is used. The plywood needs to be dry, with a moisture content of no more than twenty per cent. The fall or pitch should be a minimum of one in forty. The ply should be laid in dry conditions with adjacent gaps covered with tape. The Plywood needs to be secured with 50mm stainless steel screws, to the purlins or rafters. If the Butynol is not applied on the same day as the substructure is constructed, the plywood will need to be protected from moisture. The plywood may be primed with a 50/50 mix of WA98 adhesive and Butynol solvent. At this point, you should install any necessary drip edge to allow water to drain into the gutter.
It is good practice to unroll the butynol in its final position on the roof for 30 minutes, before you start to secure it with adhesive. Butynol in roll form is compressed. By allowing the rubber to rest for 30 minutes, it will revert to its natural form and make installation easier and more secure.
Mark the finished edge of the butynol with a chalk line, then fold the sheet in half.  At this point it is a good idea to run a brush width of adhesive up the center line of the butynol and onto the deck. This will allow you to secure the sheet temporarily and stop it drifting out of position.
laying butynol roofing.
The underside of the butynol and the plywood up to the chalk line, is then covered with WA98 Adhesive. Less is more, with this adhesive. Both the rubber and the plywood need to be completely covered, but with a thin coat. Big globules of adhesive will not dry properly and prevent a secure bond. When touch dry the sheet is gently folded back into its final resting place. Care should be taken to avoid wrinkles and air bubbles. A hard faced roller will help even out any imperfections.
The second half of the rubber can then be folded back and secured in the same manner.
simon@roofing.net.nz