Fix PVC coated straining wire by passing it through 5mm holes drilled
in the top faces of the apex/top purlin and the eaves/bottom purlin at
383mm centres. The wire to pass over the intermediate purlins. The first
straining wire to be fixed 50mm away from gable end. Evenly tension all
wire ensuring that cut ends face downwards.
Roll ALUTHERM® down the slope of the roof with the edge without
the loose lap facing the end of the building from where one wants to
see the neatest finish. Cut sheet to length plus an additional 200mm
of ALUTHERM® to use as a grip for tensioning the material. Place
ALUTHERM® over the straining wires and ensure that it is laid square
to the building.
Attach ALUTHERM® to the eaves purlin using good quality double sided
adhesive tape of either 24mm or 48mm width. Firmly grip the top end
of the material and pull to tension the ALUTHERM® and attach to the
apex purlin again using double sided tape.
All subsequent sheets of ALUTHERM® to be fixed as above with the
edge without the loose lap laid over the lap of the previous sheet.
Straining wires must be positioned at the centre of the overlaps i.e. not
more than 50mm from the edges of the underside of ALUTHERM®.
ALUTHERM® may be installed in a domestic application a number
1. Over purlins or timber battens.
2. Under tile or slate roofs under timber batten.
3. Above ceiling laid loosely on ceiling in roof space.
NOTE: When using metal sheet product can be installed
horizontally or vertically.
For installation where trusses are further apart than 686mm we
recommend the use of PVC coated straining wire for support.
Lay the roof sheeting as soon as possible after the fitting of