The “Build a Pergola” MITREPLAN has extensive information on pergola
construction, but we also found it useful for our repair project.
Our pergola has some rafters that have separated from the beam they were joined
to. The joint failed because the nails used to fasten it were too short.
To repair joints, you could use brackets, nail plates or blocks, but on our
pergola they would look out-of-place. We’ve chosen to use 100mm long galvanised
screws, and an exterior wood glue (Selleys Durabond). We needed mechanical help
to lift the rafters back into position, so we hired some “Acrow” props from
Kennards. Make sure you get a hand when erecting props, and spread the load by
using planks or sole plates.
Lochie then carefully removed the old nails, levelled up the rafters and applied
the glue and screws. We used a pipe-clamp to bring the rafters and beam together
To repair battens, Lochie used steel mending plates (flat pieces of pre-drilled
galvanised steel) across batten joints. He used 100mm long screws through the
mending plates and into the rafters to prevent the battens from “popping” again.
MITREPLANS are available at all Mitre 10 stores across Australia.