Undercloak Dry Verge

• Working Procedure
• Components
• Documents

1. Felt and batten the roof in the normal manner, ensuring that the felt and battens are trimmed to be in line with the outside edge of the external wall or bargeboard at the verges.

Note: Do not fix batten to gable rafter yet.

2. Offer the undercloak up to the verge, position under the batten ends, but on top of the felt with the bottom leg hard against the external wall or bargeboards.

3. Slide the angled connector onto the full length unit, ensuring that the centre line of the angled connector is in line with the bottom of the eaves batten. Slide into the angled connector either a left hand or right hand short eaves length (and seal with a silicon sealant), ensuring that the bottom overhangs into the centre of the gutter, and nail to fascia.

4. Offer up subsequent dry verge sections to the verge and join using expansion connectors. Use mastic to fill each joint on the inside of the undercloak channel to prevent leakage. Trim to a mitre each undercloak dry verge at the ridge ensuring there is at least 5mm gap where the two undercloak dry verge sections meet. This gap is necessary to allow for expansion caused by the heat of the sun.

Note: Where there is a block end ridge at the gable this will cover the join. If no block end ridge is used then the 5mm gap will need to be filled with a silicon sealant.

5. Nail batten ends to gable rafters.

Note: If the distance from the final batten fixing to the end of the batten is greater than 300mm when using 38 x 25 battens or 400mm when using 50 x 25mm battens, then it will be necessary to double batten at the verge for added strength.

Repeat steps 2,3 and 4 for the other verges.

6. Press the undercloak hard up to the outside of the wall or bargeboard. For Hardrow®, Centurion®, Senator® and V2® only, position a hook clip on alternate battens located under a standard verge clip - which is positioned on every batten - and fix with 2 x 25mm aluminium nails.

Note: Do not nail into the verge unit as this will restrict thermal movement.

Tile the roof in the normal manner, ensuring that the verge tiles are properly located in the undercloak verge clips.

Note: It is a requirement when laying Centurion® or Senator® tiles that verge tiles are used, to enable the verge clip to locate correctly