Timber Frame on Slab foundation, soleplate connection ?

[coxsox]

In the process of constructing a Timber Frame extension and as part of the planning stage I am looking at the foundation construction. All the calcs have been completed by a SE and I'm ready to go.

I have a query over the connection of the timber frame (145mm wide) to the soleplate and raft. To maintain DPC 150mm above ground level I am looking at the attached picture construction. The wall below the soleplate needs to be made up. I see 3 options available:

1. build up raft, further reinforcement required, overkill
2. use engineering bricks, maybe 3 courses, only 100mm wide, so use two rows ?
3. use 3 pieces of timber to build up to sole plate, potential damp / rot issue.

Can anyone suggest the best method for this construction to build up wall below soleplate and best way to secure soleplate to raft ?

I've looked around here, and the web, and there seems to be a few options, which makes it more difficult to decide best method.

thanks

Untitled

• coxsox
• 29 Mar 2012
• 1

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[^woody^]

You would build the inner leaf up in suitable brickwork or blockwork, or both, up to DPC/finished floor level, and then fit the sole plate. No timber below DPC

If that 145mm is the frame thickness, then best to use 150 blockwork rather than cutting bricks

You can screw and plug the plate through the DPC with no adverse issues

Also, your cavity insulation needs to go down to the level of the floor insulation, or you need to have a 25mm insulation upstand around the floor perimeter

 

[coxsox]

brilliant, forgot all about 150mm blocks, something like these...?

http://www.condell-ltd.com/ProductDetails.aspx?ProductID=454

although these lights aeriated ones never feel as solid as the aggregate ones

Will also use upstand insulation, just missed it off the diag