water leak

tobinj6

hi i have a headache i recently put roof on my shed and put windows in and now even though it is water tight i have a small puddle of water on the floor near the back wall the roofer tells me it is not coming from the roof so where else is it possible to be coming from i poured all concrete together as a raft foundation before building the walls and i wonder would it be possible for the water to be coming in at back wall under blocks where the damp proof is. somebody give me advice on wat to do

mickdw

Is it a single leaf wall?
Is the outside ground level below the floor level?

If its a single leaf wall, the water could be coming straight through it or under it.
If its a double wall, did you put a step in the raft?

Can you see where the wet area starts and finishes?

tobinj6

mickdw wrote: »

Is it a single leaf wall?
Is the outside ground level below the floor level?

If its a single leaf wall, the water could be coming straight through it or under it.
If its a double wall, did you put a step in the raft?

Can you see where the wet area starts and finishes?

ye if you walk in the main door it is dry as you are walking into a slab of concrete from grass but it is when you go left and at the back wall towards back of the house where the main back wall of house is and this is on a slab of conrete so the water could possibly run down the back of shed and there is a walking gap at back of shed very small gap but no drainage from there just have gutter downpipe sitting on capping of back wall running into field at back of house so ground level would be the same it is a single layer of cavitys

li@mo

tobinj6 wrote: »

it is a single layer of cavitys

I dont understand.......

Which is it?
a cavity wall with 2 leafs

or a single leaf wall with no cavity?

Any chance of posting a few pictures of it?

tobinj6

li@mo wrote: »

I dont understand.......

Which is it?
a cavity wall with 2 leafs

or a single leaf wall with no cavity?

Any chance of posting a few pictures of it?

hi i cant send photo sorry as dont have camera can organise getting a few though the shed is built with cavity blocks just a single layer for every boundary wall 6.5m wide x 4.5m high and it has an apex roof but i cant see any sign of water comin inside roof but there is small puddle in the shed and i wonder where it might be coming from if this is any help to you

li@mo

tobinj6 wrote: »

hi i cant send photo sorry as dont have camera can organise getting a few though the shed is built with cavity blocks just a single layer for every boundary wall 6.5m wide x 4.5m high and it has an apex roof but i cant see any sign of water comin inside roof but there is small puddle in the shed and i wonder where it might be coming from if this is any help to you

I think I understand. It is possible that moisture can come in through the cavity blocks but thats not your problem.

I just cant figure it out. You will probably have to get someone else out to look at it

tobinj6

li@mo wrote: »

I think I understand. It is possible that moisture can come in through the cavity blocks but thats not your problem.

I just cant figure it out. You will probably have to get someone else out to look at it

thanks for your reply liamo i actually had a gut out today and he told me it is coming in under neat the blocks at back wall as the floor level is same level as outside ground level so he has told me to raise the floor by 2 to 3 inches inside and it would sort the problem out have u heard of this before.also he said that the small damp patches on the felt where due to condensation as it is so cold outside

muffler

Not so sure about raising the floor. Can you reduce the ground level on the outside?

li@mo

tobinj6 wrote: »

thanks for your reply liamo i actually had a gut out today and he told me it is coming in under neat the blocks at back wall as the floor level is same level as outside ground level so he has told me to raise the floor by 2 to 3 inches inside and it would sort the problem out have u heard of this before.also he said that the small damp patches on the felt where due to condensation as it is so cold outside

Ya thats possible but if its only 2 or 3 inches....then why not do what Muffler said and lower outside ground level by 4 or 5 inches if possible.

If the garage is only new.......the water could have been there all along before the shed was watertight?

If so, you could plug in a de-humidifier and let it run for a day or 2 until water disappears, and wait and see does the problem return.

If it doesnt return in this weather.........it never will:D

Poor Uncle Tom

tobinj6 wrote: »

...the small damp patches on the felt where due to condensation as it is so cold outside

If there is a puddle of water on your floor coming from a breach in the wall at DPC level a wet looking line should join the puddle to the point of ingress. If the water is dripping from a leak or condensation on the inside of the roof it could lead to a puddle on its own on the floor.

tobinj6

Poor Uncle Tom wrote: »

If there is a puddle of water on your floor coming from a breach in the wall at DPC level a wet looking line should join the puddle to the point of ingress. If the water is dripping from a leak or condensation on the inside of the roof it could lead to a puddle on its own on the floor.

ok i have a wet lookin line joinin the puddle so please tell me what i can do if i could lower concrete level outside i would but unfortunately where this is happening is right at the back wall and the unfortunate thing is i built my back boundary wall of my shed 6 inches away from back wall so i cant even get around the back to do anything with the concrete to lower it so wat else can i do somebody help

Poor Uncle Tom

tobinj6 wrote: »

..if i could lower concrete level outside i would but this is right at the back wall and i built my back boundary wall of my shed 6 inches away from back wall so i cant even get around to lower it..

OK, your options:
a) If the water coming in is just the water getting down between the shed wall and the boundry wall then flash from the shed wall over the boundry wall.

b) If the water is coming throught the boundry wall and the shed wall from the property beyond, contact the landowner and ask could you lower the ground a bit on his/her side,(much easier if it is a green field).

c) Tank your shed wall.

d) Raise your shed floor above the point of ingress.

e) Remove a couple of blocks at the affected point and drop the level of the ground between the shed and boundry wall (could be done in a couple of places to access all the area).

f) Remove the back wall of the shed sort the levels and rebuild.

g) Live with it as it is.