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we are rebuilding a timber framed extension (not brick) 3.6m x 3m, clad in weather board, roof is obs board covered with 3 layers of felt, 100mm kingspan between joists and have 50mm foil backed board to go under(not up yet), we have a vented soffit board but there is no vent at the highest...

we are rebuilding a timber framed extension (not brick) 3.6m x 3m, clad in weather board, roof is obs board covered with 3 layers of felt, 100mm kingspan between joists and have 50mm foil backed board to go under(not up yet), we have a vented soffit board but there is no vent at the highest...