Step by Step Guide for Installing your Rubber Flat Roof
- Clean the roof surface prior to installation.
- Install drip back section and prepare any chases on upstand/wall details.
- Position rubber over roof deck area, relax the rubber for 30 minutes, then fold back in half.
- Apply water-based adhesive to the main field area leaving the last 100mm around the perimeter to adhere using Solvent Contact Adhesive. Lay the membrane into the water-based adhesive and then repeat for the other half.
- Brush out any air bubbles whilst pressing the rubber into the adhesive. Complete adhesion by applying contact adhesive to the perimeter and upstands – contact adhesive should be applied on both surfaces.
- On roof detail areas where you need to cut the membrane, a flashing tape should be used – flashing tapes requires a primer on the target area which should be applied using a scrub pad.
- Further Quicktrim (Check Kerb or Drip Trim) should be applied to the perimeter and any wall flashings should be applied.
For further guidance please see our full installation guide, our instructional videos or call our support team on 01392 927729
1. Roof Deck Preparation.
- Clean the roof surface prior to installation and ensure the roof surface is clean, free of dust, dirt, rust, oil, grease, and loose material. The roof surface must be dry as this product will not adhere to wet surfaces.
- Trapped moisture may vaporise and negatively affect the performance of EPDM Rubber Flat Roof Solutions. This system is best installed onto a timber deck either exterior grade ply or OSB3.
- Any residual bitumen from an old roof should either be removed or over boarded as this will adversely affect the performance of the EPDM rubber membrane.
2. Install Drip Batten.
- Install the Drip Batten wherever a gutter is present. This will extend the roof deck so that water drips into the gutter, rather than behind the gutter.
3. Install Drip Back Drip Trim.
- The Drip Trim has a front and back piece.
- Install the Drip Trim back piece using the flat annular nails provided.
- Align the curved top edge of the trim with the timber batten.
4. Chase out Wall Upstand.
- Using an angle grinder or mortar chisel, chase out brick mortar joint, ready to accept the Wall Trim Flashing.
5. Relax the Rubber Membrane.
- Allow the rubber membrane to relax in position for 30 minutes.
6. Fold Membrane Halfway.
- Fold the rubber membrane back to expose half of the roof deck.
- Apply Water Based Deck Adhesive using a 9″ paint roller.
- Leave a 100mm unbonded area around the roof deck perimeter. This will be used later to bond with Contact Adhesive.
- Roll the EPDM membrane back into position immediately, whilst the adhesive is STILL WET.
- If the adhesive dries out (and becomes opaque), before the membrane is relayed then a thin coat can be applied to the back of the MEMBRANE and allowed to dry before installing.
- Apply adhesive to a smaller area in hot weather to avoid premature drying.
- Please note: water-based adhesives should only be used when the outside temperature is 5 degrees and rising and no chance of freezing conditions in the following 24-48 hours.
8. Sweep EPDM Membrane
- Sweep the EPDM membrane to remove the trapped air and improve bonding to the substrate.
9. Apply Contact Adhesive to Roof Perimeter
- Apply a THIN coat of Contact Adhesive to the roof deck perimeter (approximately 150mm width) and any vertical upstands.
- Also, apply the Contact Adhesive to the back of the rubber membrane.
- Contact Adhesive can be used to bond the rubber membrane to most porous and non-porous surfaces so it can be used in place of water-based deck adhesive if necessary.
10. Ensure Contact Adhesive is Touch Dry
- Ensure the Contact Adhesive is touch dry and there are no puddles of adhesive.
- The Contact Adhesive gives off a vapour as it cures.
- If the membrane is bonded the Contact Adhesive has fully dried, bubbles/blisters may appear.
- These bubbles should disappear over time due to the EPDM membrane being breathable.
11. Cut Back Excess Material
- Trim any excess material from walls and upstands, using the chase out as a guide.
12. Cut Flashing Tape to size
- Elastoform is used to waterproof details in the roof shape which cannot be achieved with the rubber membrane such as external corners. Cut 9″ Flashing Tape to size allowing upstand height plus an extra 75mm on the length by 150mm on the width. (75mm on to rubber & 75mm on to Brick/render).
13. Apply Rubber Primer
14. Ensure Primer is Touch-Dry
- Ensure the EPDM Rubber Primer is touch-dry.
15. Install Flashing Tape
- Install Flashing Tape.
- When installing Flashing Tape, always bond the area which requires no stretching first, leaving the stretching part until last.
- Keep the Flashing Tape in a warm place in cold weather, as this will aid the moulding process.