Pitched Roofs
Issues to Consider Issues to Consider
Design Considerations
Full Fill Between & Under Rafter Insulation
Partial Fill Between & Under Rafter Insulation
Between & Over Rafter Insulation
Over Rafter Insulation
Partial Fill Between & Under Rafter Insulation
Breathable Membrane - Horizontal Installation on Continuous Substrate
Breathable Membrane - Vertical Installation on Discontinuos Substrate
  Nilvent Membrane - Horizontal Installation on a Continuous Substrate


INTRODUCTION
Typical continuous substrates would be full fill between rafter insulation over rafter and application where a sarking board has been used. Kingspan nilvent® is either installed under counter battens (see figures 1and 2) which provide a channel for water drainage or in situations with a sarking board under a natural slate roof, directly under the slates (as neither slate battens or counter battens are used). This latter construction is more typically used in Scotland. (See figure 3)

Figure 1

Horizontal Installation on a Continuous Substrate
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PRODUCT DATA
Product Data
FIXING DETAILS
  • Fit an eaves strip of UV–resistant material to overhang the eaves/fascia by 50–60 mm.


  • Start laying Kingspan nilvent® at eaves in horizontal runs.


  • Lap the Kingspan nilvent® logo–up over the eaves strip (if required) with the bottom edge of the Kingspan nilven®t in line with the top of the fascia.


  • Kingspan nilvent® should be laid taught.


  • Temporarily tack in place with staples or clout nails and cut to length with a sharp bladed knife.


  • The second run of Kingspan nilvent® should lap over the first by 150 mm.


  • The printed tramlines on the top surface of Kingspan nilvent® indicate 150 mm.


  • Use 75 mm wide double sided acrylic adhesive tape to seal horizontal laps.


  • Vertical laps of Kingspan nilvent® should be at least 100 mm and positioned to coincide with a rafter position, and be sealed by the fixings of the counter battens.


  • In constructions with a sarking board under a slated roof with no counter battens or slate battens, the vertical laps are taped with 75 mm wide double sided acrylic adhesive tape and tacked in place with staples or clout nails.


  • Continue installation up the roof in the same manner to the ridge.


  • Lap over the ridge by not less than 150 mm each side (total overlap of 300 mm).

Figure 2 (Ridge Detail)

  
Ridge Detail
Figure 3 (Alternative – Scottish Style Detail)
Scottish Style Detail