Drain sump
boundary
Hot Air Weld
Field membrane
cut to lay flat
in sump area
Hi-Pro PVC
Cut Edge
Sealant
Hi-Pro PVC Membrane
Hi-Pro PVC
underneath
Min. 4 cm (1 /1")2
wide hot air weld
Insulation
Drain clamping ring
Hi-Pro PVC
Membrane
Min. 4 cm (1 /1")2
wide hot air weld
Min. 8 cm (3")
Continous
field membrane
Lexcan Universal Single Ply Sealant
Notes:
1. All drain bolts or clamps must be in place to provide
compression on Water Cut-Off
2. Cut membrane so it extends a minimum of 13mm (1/2”)
from attachment points of the clamping ring.
3. Cut edge sealant is required on cut edges of Hi-Pro
PVC membrane.
4. Seam overlap direction to be reversed if main field
membrane is Hi-Pro Fleece-Backed Membrane.
Drains with Tapered Sumps
greater than 3:12
Scale: Not to scale
Roofing System Detail
Detail No.: P-S-323
Date: August, 2016