What are the risks having timber frame garden room bigger than base?

[sd2901]

I am getting a garden room in and noticed when the structure went up today, that the timber structure is bigger than the concrete base on one end. The timber frame is bigger than the concrete base by about an inch on one end. What are the risks to the structure in this case?

 

[mrrusty]

No harm at all unless the bearing is reduced so significantly it can't adequately support. They've put it up so they obviously think it's OK, and also it's quite a good idea to have the timber structure overhanging the concrete base because then the top of the base is protected from water getting on to it and running across the top of the base in to the structure. You want run-off to be outside the concrete base not on to it

 

[sd2901]

Thanks for your quick reply @mrrusty. The frame is 3 inch timber. 3 of the sides are flush with timber frame and base. The slats for the walls come over the base slightly for the water run off. I just thought it was odd that on one side the 3 inch timber frame over ran the base by one inch rather than having the distribution even.

The room is 7 x 3 meters. The over hang is on one of the short side. What you said makes sense, "they put it up so obviously think is ok". Given the over hang is on the short side, it probably has adequate support.

 

[mrrusty]

Did they do the base or did you? It sounds like it's nothing to worry about. The weight of the roof will all be on the long sides in any case - there won't be much on the short sides so IMHO it'll be absolutely fine.

 

[sd2901]

The same company did the base and are installing the garden room. Thanks again for your feedback, glad it's not a big issue that will cause problems later on.

 

[Notch7]

I am getting a garden room in and noticed when the structure went up today, that the timber structure is bigger than the concrete base on one end. The timber frame is bigger than the concrete base by about an inch on one end. What are the risks to the structure in this case?

It’s better to be slightly smaller than bigger.

you want the cladding to come down over the base so rain doesn’t get on the base.

if it’s an inch one end, they should’ve done it equal both sides really

 

[morqthana]

you want the cladding to come down over the base so rain doesn’t get on the base.

Tis also good to dig a trench around the base, line with landscaping fabric, and fill with gravel to stop (usually dirty) water splashing up the walls.