How to Install a Resitrix Flat Roof Video and Installation Guide

The roof deck should be clean and dry. Refer to installation manual for preparation of different substrates such as felt and asphalt overlays and bonding to metal decks.

Stir the FG35 Primer. FG35 primer should be kept in a warm room prior to installation if the weather is cold. This will help achieve a consistent even coverage.

Apply the FG35 primer evenly using a medium pile roller. Always ensure primer is applied to the perimeter and upstands of the roof first before coating the main roof area. (50% coverage of the centre of the roof is acceptable using a checker board pattern)

Allow the primer to fully dry before laying the membrane this could take between 30 minutes and 1 hour. Never prime an area bigger than the area to be covered in one day

Roll out the rubber membrane taking note of the non adhesive lap when laying out adjacent sheets

Position the membrane against any upstands and score the release paper as this will be removed at a later stage.

Once the membrane has been positioned roll the membrane back to the centre of the roof so that the release paper can be removed.

Score the release paper with a sharp craft knife.

Remove the release paper whilst rolling the membrane back in to position

Use a broom to ensure that the membrane has full contact with the primed deck

Bond membrane to upstands and walls by removing the release paper.

Form internal corner. It is often best to remove the release paper in stages leaving the paper inside the pigs ear till last to be removed. There is more than one way to waterproof an internal corner please see the second option later in the guide.

Repeat process for adjacent membrane sheets

Cut the membrane to length and around roof details

Additional self adhesive sheets can be used to waterproof upstands. Ensure sufficient membrane is allowed for to give a 50mm overlap on the deck membrane and adjacent corner membrane.

Heat weld any membrane overlaps prior to installing corner patches.

Heat weld the flap used to wrap around the external corner.

Cut a circular corner patch and cut out a finger width section from the circle, rounding off any corners.

Stretch the corner patch to break the integral reinforcement strands. You will hear them break and this will allow the membrane patch to cover the corner.

Heat weld the Resitrix corner patch.

Heat weld an additional piece of Self Adhesive membrane over the upstand and corner patch

Where two separate sheets of membrane terminate at an internal corner it will be necessary to install a corner patch.

Fold the circular patch in half

Fold the patch again in to quarters and release one of the folds to form a pocket

Heat weld the internal corner patch

Remove the release paper from the section of membrane that will be used to form an upstand kerb over the roof edge batten.

Use a seam roller to mould the membrane to edge detail ensuring 100% bond on angle changes

Heat weld Resitrix membrane laps. Ensure a 2" 50mm gap is maintained between the heat gun nozzle and seam roller for a consistent weld. Excess pressure should not be required to create a bleed

A good heat weld is indicated by a bleed out of the molten polymer bitumen from the bottom of the top sheet being welded

Install flat roof edge trims using the installation guide relating to your chosen roof trims

Completed installation of a Self Adhesive EPDM flat roofing membrane