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Modifying Trussed Rafters on Site
The basic rule here is DO NOT MODIFY TRUSSED RAFTERS on site unless the prior permission for the modification is obtained from the Trussed Rafter Designer.

Trussed rafters are designed for a purpose and should never be cut, notched, drilled or otherwise modified without full consideration of the resultant effect.

If for some reason an adjustment in the geometry or internal structure of the  truss is required by the site, REFER BACK to the Trussed Rafter Fabricator. He will have the engineering design for the units supplied and is in the ideal position to co-ordinate any action which may be needed.