timber frame inner walls to floor joists

[climber101]

Help again please...

for my timber frame smallish extension (with brick outer wall) 7m x3m I am wanting to build the timber frame wall sections in advance. Whilst I have seen you can build floor joists into timber frame walls like below fig A I am thinking I would prefer to build more like fig B as this might be a little less difficult for an amateur like me . (I am thinking I can get the walls and roof up and make it watertight and then come back to doing the floor joists). Appreciate I would have to make a dwarf wall for this option and it may be more time consuming than fig A.

Would much appreciate comments from the build experts here please who have done the timber frame extensions on using either B or A option please. (I am trying to settle this in order to plan my timber frmae wall heights for build) Confusingly my plans show both a dwarf wall on one detail and a built in type wall on another for the same area.

View media item 7712 View media item 7713

 

[^woody^]

Who did the plans? Looks like the drawings and the terminology has been copied direct from a book

Fig b is a pointless method as it involves more work, more materials and necessary design

You are doing a timber frame, so there is no reason why the floor is not incorporated into the whole lot. Make as much as you can in timber to get the shell up. A timber floor as in fig A, is less work for an amateur

With timber frames you work on a modular panel - which is determined by the sheathing size - normally 1200x2400, but a tip from me - some sheets are still in imperial size so it works out at 1220x2440 and can really f*** up your plans if you don't realise until you have made them and come to install them

So aim for a ceiling height of 2400 and make the panels and then just bolt them together.

Get the floor in first and work off it.

Be careful to detail the floor/wall and roof/wall junction to avoid a thermal bridge or cold spot

 

[climber101]

Thanks again woody you are a star ! very helpful (the fig A and B are not exact copies from my plans but the same as shown in my plans) That’s me decided - going for the “fig A” option.

What got me wondering is although my plans show a detail same as “fig A” they also show a dwarf wall in the attached cross section (you see it bottom right in the left figure in the attached).

 

[climber101]

oops hit the send button too quick without attaching, here is the attachment

Untitled

• climber101
• 7 Jan 2009
• 2

 

[noseall]

maybe to avoid thermal bridging?

maintain airtightness? whatever that is.

 

[climber101]

i was thinking because i had big patio doors in the middle of the exterior wall shown in that cross section that i needed a dwarf wall for some reason i couldn't work out - (i guess that's a load of rubbish)