Flashing & Sealing your EPDM to your Skylight Frame

A step-by-step guide on how to bond, flash & seal your Elevate EPDM membrane to your timber skylight frame.

This guide is to assist you once you skylight Kerb has been installed as per the instructions, & your EPDM membrane has been bonded to your decking.

Firstly, your timber kerb must be completely dry. Ensuring this, your excess EPDM from when you cut the opening out from the corners towards the centre, can be bonded to the face of your Kerbs.

More information on trimming your EPDM opening can be found in Roof Preparation Tips for your Skylight

Step 1: With your excess membrane folded back, use your Elevate Bonding Adhesive Spray, to apply an even coat to the folded back EPDM & the face of your skylight kerb.

Take care not to get excess spray on the face of your EPDM or in the skylight opening.

Step 2: Once your adhesive is touch-dry, bond your EPDM to the timber kerb.

Starting at the bottom, work into the where the decking meets the bottom of your kerb, then working up the face of the kerb.

Use your Silicone Rubber Roller & Penny Roller to work in, ensuring no air pockets.

Step 3: You will now have corners to seal where your EPDM does not cover. This is also covered in good detail in External Corners.

In shorter detail, you must use your Quick Seam Form Flash to seal each corner.

You will flash your corner in with 2 separate pieces – each piece will wrap around the corner 75mm. Your flashing will need cover 75mm past any areas your EPDM isn’t bonded to. 

Using your chalk/crayon, mark 75mm onto your deck, and 75mm past the top of your v-shape. This will be rectangular.

Step 4: Cut your 2 pieces of quick seam flashing to size. Each piece will fit either side of your corner & work around the corner 75mm.

Using your Quickscrub pad & handle, apply an even coverage of Quickprimer plus to the area within the chalked area, plus an additional 10mm. 

Step 5: When your primer is touch-dry, smoothly mate one side into position, start at the top & and working down. Before you mate to the deck, wrap your 75mm overlap around the external corner, then mate to the deck, smoothing the corner out.

Using your Silicone Rubber Roller & Penny Roller, work in the flashing. 

Step 6: You will now need to apply primer to where the second piece will overlap the first piece you bonded. Complete this, then once touch dry, apply your second piece, same as the first.

Use your silicon rubber roller & penny roller to thoroughly work in.

For an extra layer of protection, you can neatly apply a bead of Elevate Lap Sealant to your flashing edges.