I am building a shed using dense concrete blocks (not the light aerate
ones). The walls are single leaf and I want to put up a double pitched
roof ( approx 20 deg pitch ) over it. I need to fix a 3x3 timber wall
plate on top of and along two of the walls. The wall plates will take
the lower ends of the rafters and collars. The wall ( and hence the
wall plate ) is 4m long.
I will be laying a thin bed of mortar first and then place the timber
on it and I have a several long restraint straps to hook over the
plate and fix to the wall. But I'm concerned about actually fixing the
wall plate to the masonry. I've looked at the Building Construction
Handbook ( R. Chudley ) but can't see this detail. Plenty of diagrams
showing wall plates but no explanation of how it's kept in place.
Maybe additional fixings are not used for the wall-plate but instead
it only needs to rest on the top of the wall and the rafters, collars
and restraint straps together keep the entire roof assembly in place?
Anyone done this or knows what I need to do? If fixings are needed,
can anyone recommend which ones I should use for dense concrete block?
Cross section view:
| | < wall plate
==== < bed of mortar
| | < very top of the
| | < single block thickness wall