Hi,

It became apparant when the tiles where stripped that the 1970s monkey who
made my dormers (large dormers, half a room each) was a complete moron.

In short, the roofers strongly recommended sheetsing the inside of the 3x3"
timber frame with glued and screwed 18mm sheet to add stiffness and to brace
the odd bits of timber that are not particularly well jointed.

So the question is:

Ply or OSB for structural sheeting work?

And if ply - what does "structural ply" actually have over "regular" ply,
apart from the price? Is "shuttering" (the cheapest) "structural" by default
or the opposite.

When I was a lad, ply was ply, except for marine ply - we didn't have much
of a choice to my memory


Cheers!

Tim

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