ROOF SURFACE PREPARATION
The prepared roof surface must be clean, dry, and free from dust and contaminants (bitumen, oil, etc). Do not attempt to install EPDM on a damp or wet surface, as the trapped water may vaporize, causing damage to the roof sub-structure.
When applying contact bonding adhesive to the roof deck in temperatures below 5 degrees Celsius, condensation can form on the top layer. If this happens, do not continue with the installation.
Wait until weather conditions improve before attempting the installation again. When the weather conditions are improved, a thin coat of adhesive is applied over the old adhesive, and the installation is continued as normal.
- Contact bonding adhesive and primer release gas when they are drying. If they are not given enough time to dry before the membrane or tapes are applied, blisters may form. The blisters may subside over time and do not usually adversely affect the installation.
- Do not stretch the membrane or cured cover strips during installation. The only product designed to be stretched and moulded into shape is the uncured flashing tape.
- Once the membrane is installed, it can be gently walked on but be careful not to puncture the rubber, if in doubt lay some timber boards to walk on (especially if using a ladder on the roof to access other areas) If regular or heavy foot traffic is likely a protective layer must be installed (usually walkway pads, slabs or decking)
- The new surface can become slippery when wet or covered in frost.
Always remove the required mortar lines for the installation of either wall trim or lead flashing before installing the membrane. This helps to prevent damage to the EPDM membrane and excessive build-up of dust. - The FlexiProof One Piece membrane can be fully bonded on to a variety of surfaces including OSB, concrete, fiberglass, smooth metal and most forms of masonry.
The FlexiProof Fleece-Backed membrane is bitumen compatible and is designed to be laid directly over existing felt or asphalt surfaces.
Ensure the specified roof deck material is OSB3 to achieve the BRoof T4 fire rating.
When installing the membrane make sure the area is of a manageable size, in warm weather if the area is too large then the adhesive could cure before you have had time to fit the membrane.
