Water getting into summer house at floor level

[Scotfiona]

Hello from a newbie. A local builder built me a summer house on a concrete base, clay soil, and tells me there are 4 inch joists between the base and the floor. When it has been raining there is water appearing between the skirting and the floor although the top of the skirting is dry. He has put a new torch felt roof on as there was a problem there before. Now ceiling and walls dry but floor wet round the edges and at some seams. He is flummoxed, sealed all the tongue and groove but makes no difference. Any ideas would be welcomed. Thank you.

 

[Burnerman]

Inside and outside pictures of the problem area if you can please, Fiona- maybe water is coursing down the T and G and creeping in.
Is there a gutter fixed?
John

 

[Scotfiona]

Thanks for your reply. There's a gutter at the back at the slope of the roof. He's also dug a trench and thinks a soak away will help there. Today though water near the electricity cable, which is bone dry, at floor level, level with the deck at the front. New roof t and g sealed so shouldn't be getting in there. but we can't see how it can be coming up. Could it be to do with clay soil.

 

[foxhole]

There does not appear to be any overhang of the base by the walls which would allow rain to run under them .

 

[Scotfiona]

Thanks for that. As I recall, the frame of the summer house is the same size as the concrete base, so the only effective overhang would be the width if the t and g. Is that enough?

 

[Burnerman]

It does seem to be well enough sealed from outside, but some overhang would have been maybe better.
However, if the wet is coming in all along the skirting it could well be dripping down the gap between the outside timber and the lining inside. How well sealed is the window? A small grooved cill on the window base again helps to cast water clear. Can you hear any dripping during rain?
I'd also like to see a deeper step from the door to the decking but I can understand why you wouldn't want to shift it!
John

 

[foxhole]

Window to side seems to be set in timber frame which sticks out which could collect rain and allow it inside.

Guttering is also too short letting rain pour down the corners, if the white staining is the sealant then also suggests incorrect choice of sealant.

Can't see any overhang to gutters , which again could cause problems.

 

[Scotfiona]

Thank you both. Lots of things to think about. I'll look further at the window. I think he's sealed the drain holes by mistake but wouldn't have thought that should accumulate so much water.