Timber Frame on Slab foundation, soleplate connection ?

15 Mar 2012
Reaction score
United Kingdom
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.

Sponsored Links
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

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links