Formalised performance specifications for rainscreen cladding

CIMclad: Formalised performance specifications for rainscreen cladding
GENERAL SEALANTS:
Must be stable and compatible with all contact products and finishes
and be selected in accordance with BS 6213 from:
Silicone to BS 5889
One part polysulfide to BS 5215
Two part polysulfide to BS 4254
One or two part polyurethane.
NBS Section H92 770
Sealants
20 Rainscreen
Materials and
Finishes related
Standards
THERMAL INSULATION:
- Material: ______
Manufacturer and reference: ______
Thickness: Not less than ______ mm.
- Attached to the outer face or supported within the backing wall so as
not to bulge, sag, delaminate or detach during installation or in situ
during the life of the rainscreen cladding.
- Keep dry during installation.
776
Insulation
VAPOUR CONTROL LAYER:
- Material: Reinforced translucent polyethelene sheeting;minimum
nominal thickness 0.37mm
Minimum vapour resistance: 500 MNs/g.
- Lay as work proceeds ensuring continuity and with the minimum of
joints.
- Lap edges of sheets not less than 150 mm and seal with tape. Seal
with tape to pipes, ducts, structural members, etc. which abut or pass
through. Prime substrates as necessary to ensure a full bond over the
width of the tape.
- Tape: Double sided sealant with vapour resistivity not less than the
vapour control sheet.
Size: Mimimum 15mm wide.
- Before covering check for tears and punctures. Carefully repair,
sealing with a lapped patch of vapour control sheet and a continuous
band of sealant tape along all edges.
780
Vapour Control
Layer
July 2001 Page 27 of 27