Provide 60 minutes fire stopping to 5nr party walls in the roof space of 6nr dwellings, Dublin. The work consists of fire stopping between the underside of the roofing felt and also the top of the existing blockwork party walls. Additionally it requires firestopping between the underside of the roof slates and the top of the roofing felt. This was all carried out from within the dwelling.
The 5nr roof spaces internally are to be upgraded using Envirograf Product 129 – Internal roof fire break. It's designed to inhibit the spread of fire and smoke from one roof space to another. The product is fitted by two fitters both working from inside the roof space following the sequence set out below. The fire curtain is fitted between the rafter and the face of the party block wall. Intumescent sponge is placed under the roof felt and between the battens along the line of the roof.
It’s important that gaps between the party wall and the underside of the roofing felt are properly fire-stopped prior to the application of the fire barrier using properly tested and certified products.
The party wall has been fire-stopped, so has the gap between the underside of the slates and the top of the counter-battens. This was done using the proprietary system products. In addition the intumescent adhesive has been applied and the curtain fixed in place prior to the final installation of the metal fixing battens along the inside of each joist.
Finally, external application of Envirograf system to the eaves is carried out in line with the internally fitted sponge. Sealing the Party wall above and below the felt. Also sealing at eaves level preventing the passage of flames and smoke throughout the roof-space of the houses.
