Just moved into a new house in mapplewell with a prefab garage. During the past couple of weeks there has been large puddles on the floor. Dont think its the roof it has gutters and on one side it goes into drain but on the other it just sits in the gap between wall and garage. Access is very poor all the way round so was thinking about raising the floor level within the garage. Has anyone done this?
If surface water is running towards your garage and getting beneath the door, you may need to consider sinking some channel drainage (such as Aco Raindrain) across the threshold. If you suspect water is weeping beneath your prefab panels, you could run a thick bead of a good external silicone (one of best available is C-Tec CT1) around the internal perimeter. Not known of raising a garage floor before, though it does sound viable, but be sure to put mesh in the concrete to stop it cracking up.
Thanks for the reply. Its defo seepin in under the prefab walls. I think that might be the cheapest option and the one to try first its a shame i cant get between the sides a rear of the garage to slope the ground so the water can run into nearest drain. Do you know who sells that ctec stuff? Cheers
Have you thought about going on the garage roof and running a gutter or pipe around the back from the garage to connect the bad side up to the good side?
I see you're at Darton, so Buildbase on Wakefield Rd (old BMB Builders Merchants) do it. Expect to pay around a tenner a tube mind, but it is top clobber.
Thats not a bad shout, it might reduce surface water but it comes in from both sides, if only the previous owner thought to put a slight gradient on the foundation.
Where the wall meets the floor on the inside of the garage is there a curved or sloped but of concrete like this?
http://diyprojectsandstuff.blogspot.co.uk/2014/ This link shows somebody who had exactly the same problem as you (they had water collecting at the base of the walls on the outside of the garage and seeping under the concrete sections and had no room for access outside to do anything about it. A new concrete fillet around the base and a good coat of liquid damp proof did the job. The rest of the blog entry is just about making things pretty.
That will make a big difference then. Mix up some concrete and knock something like that up and then paint a load of liquid damp proof up to about 6 inches and it should stop pretty much all of it especially if you try to do something with the guttering. We also bought a rubber door strip that you stick down across the doorway to seal that off and stop water coming under the door
Whatever you do, do not seal round the outside, it causes perculation to the inside and prevents whatever gets in from getting out again. Do everything from the inside. One way to do it is to put some angle iron upside down all round the inside then concrete fillet it, make sure there is an exit point for any water to escape at the door frame. This method allows the water to get under the walls but stops it ingressing any further into the garage and gives it way back out again. If the base hasn't been prepared correctly you will never stop water getting in however you seal it.This method gives you a drain away inside the garage. This information is from experience and believe me I tried everything I could think of and it was a builder friend who suggested this method by explaining the perculation effect.