EWS320 Celuplast Ltd – Guardian Roof
Guardian Roof is a proprietary solid roof system to replace an existing translucent roof of a domestic conservatory or porch. This roof system achieves the u-values specified in Table 2 of Approved Document L1B. This registration applies to the roof only.
Approved Document A: The existing structure will need to be assessed to ensure its adequacy for taking any additional loads and may include exploratory investigation of the existing construction.
Approved Document L1B states that the amount of glazing allowed to an extension is 25% of the floor area. In order for this limitation not to apply, there should be:
1. Effective thermal separation must be maintained between the dwelling and former conservatory or porch.
2. Any existing independent temperature and on/off controls to any heating system installed within the former conservatory or porch may be maintained.
Refer to: Technical Guidance Note MG0010411 Application of Part L to Conservatories attached to existing dwellings
And: LABC guidance on solid roofs to conservatories and porches attached to dwellings
The roof specification designed to achieve 0.18 W/m2K comprises;
Metrotile Steel Lightweight profile or Guardian Slate tile on BS 5250:2011 compliant breathable membrane on 12mm exterior grade plywood or 12mm OSB Board fixed to the top of rafter profile with screw fixings @ 200mm centres. The aluminium rafter profile is designed according to span and pitch. Profile centres will be determined by the engineering software depending on roof design 25 x 50 timber batten fixed to the bottom the profile at 330mm centres. 40mm thick foil faced insulation fitted between the rafters immediately on top of the battens leaving a 54mm ventilated cavity space under the plywood or OSB Board and between the rafters. 25mm insulation fitted tightly between the battens followed by 60mm tissue faced insulation with a bonded gypsum board face fixed to the underside of the battens with stainless steel drywall screws and plaster skim finish.
Valid until 1st September 2019