Structures + Safety
Step 2: Fixing supporting posts
Dig foundation holes 450-600mm (1.5-2.5ft) deep and fix supporting posts with hardcore and cement checking they are vertical and in line with the direction of the pergola.
Step 3: Fixing the main beams
Main beams should now be attached to the top of the posts to form the side supports on which the crossbeams will sit.This can be achieved either by fitting coach bolts straight through both pieces of timber - staggered as illustrated - or by cutting a rebate out of the top of the posts before fixing in place so that the joist rests on a ledge.
Secure with 75mm (3in) galvanised nails.
Step 4: Fixing the crossbeams
Crossbeams can be fitted 600mm (2ft) apart along the length of the main beams, overhanging by about 300mm (1ft).Carefully measure where they touch the main beams and cut out rebates so they slot over the main beams, then fix with galvanised nails and exterior wood glue.
If you wish to have an oriental look to your pergola, trim the bottom corners off the ends of each crossbeam and main beam - remember to treat all cut surfaces with wood preservative.
If you are fitting over decking it is a good idea to stain the pergola the same as the deck colour.
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