10
Step 7: Membrane & roof tile
Cover with vapour permeable underlay with a
vapour resistance of less than 0.25MNs/gram as
required by BS5250: 2002. Overlap all joints of
underlay by 150mm and staple down to timber
sheets. Over run ringbeams by 100mm and up
outer wall by 50mm.
Torn underlay up window frame and staple to
topside.
Fix watercourse to outer wall.
Starting bottom right corner of the roof with a
full roof tile, fix to lip of ringbeam and into the
corner of the watercourse (allow 4 x 16mm
screw fixings per tile).
7b
All tiling is from right
to left. Complete one
row at a time.
For the second course always
start with half a tile.
7c
7a
