Wet garage - identifying source(s) of water


We have bought a house with a single garage with an asbestos roof that has holes in it and needs replacing. We are trying to decide on our best options as, ideally, we want to end up with a secure, dry and insulated space that can be sectioned off so we have an office/garden room at the back and plenty of storage space for furniture, gardening equipment etc at the front. What we cannot determine is whether the wetness within the garage is purely down to a leaky roof or whether there is also water coming up through the concrete floor. The garden is prone to flooding in certain sections, including behind the back corner of the garage.

Is a builder the right trade to get in to look at this for us?

We are conscious that anyone that comes out is likely looking to do the work but at this stage we are just looking for an honest appraisal so we can consider our options.


Asked by Jay on 18th Mar 2024
Expert Trade Answers
"A builder is the right trade to ask however the concrete floor will definitely have failed
And roof will need replacing
How ever the asbestos removal will need doing 1st and con be costly so ad maybe look at that 1st
Kind regards
Answered on 18th Mar 2024 - Member since Mar 2024 - report
"I Jay, from the basic information given and without a personal inspection of the garage it would be difficult to give you a definitive and balanced prognosis of where water is getting in apart from the holes in the roof.
However, you have mentioned that the garden is prone to flooding, if the garage floor lies below the flood line then it is possible that water may also be seeping in at this level. There is also, the possibility that if the concrete floor is in poor condition, such as substantial cracks and fissures across its surface then water could be getting in through ground pressure activity. You would need an experience builder to undertake an investigation and provide a costing for the work. regards"
Answered on 20th Mar 2024 - Member since Feb 2023 - report

It sounds like you have some concerns about your garage's condition and are seeking advice on how to proceed.

Given the potential complexities involved, consulting with a builder who specialises in garage renovations and structural repairs would likely be your best course of action. Builders have the expertise to assess the situation thoroughly and provide you with an honest appraisal of the necessary repairs.

Before hiring a builder, it may be helpful to gather some information about your garage's current state, such as any visible signs of water damage or leakage. This information can help the builder better understand the scope of the project and provide more accurate recommendations.

Best of luck with your garage renovation project!

Answered on 20th Mar 2024 - Member since Mar 2024 - report
"Good morning, the best way out is to get a company to remove the roof has its damaged and a special team has to do that . If the walls to your garage is solid you can waterproof the walls . Or you can just take all down and build new garage that be waterproof. Both ways are going to cost a bit of money."
Answered on 21st Mar 2024 - Member since Mar 2023 - report
"I am currently working on a similar project . We have removed asbestos sheet roof using approved contractor . We installed a steel sheet roof with anti-condensation backing . We also installed framed ledge and brace doors with five lever locks."
Answered on 18th Mar 2024 - Member since Jan 2024 - report
"There are a few common reasons why your garage floor feels wet. The most common is old fashioned condensation, otherwise known as sweating. The issue could also be caused by poorly installed concrete (moisture below the slab)."
Answered on 18th Mar 2024 - Member since Feb 2024 - report
Based on the description you have provided, unfortunately, it is not possible to recommend a solution. Do you know how high the water table in your area is?

The fact that the garden is inundated does not mean the water is coming from below concrete floor. usually garage floor concrete design resist water ingress but not totally."
Answered on 26th Mar 2024 - Member since Mar 2024 - report
It's possibly a combination of both the roof and water retention that's causing the issue. I Would suggest putting a French drain along the external walls of the garage to deal with the water pooling issue, then deal with the roof.
If its the original garage floor its most likely not got any DPM (plastic membrane) separating the ground from the concrete so moisture can push up through the floor regardless of water pooling around the perimeter."
Answered on 26th Mar 2024 - Member since Mar 2024 - report
"Hi its clark's property services you garage is probably built on a concrete slab 6 to 8 inch fix thay normally get built with no damp proof mebrain and if your garden is alway flooding the concrete will suck up the water.apart from having a leaking roof .I hope this can help"
Answered on 3rd Apr 2024 - Member since Jan 2024 - report
"Hi you do need some one to look at that for you. As there is more than one problem. You can get a severe or structure engineer to look at it first and they can give you a report to give to a builder or the correct trade person. Few hundred should costs"
Answered on 3rd Apr 2024 - Member since Oct 2023 - report
Find Tradespeople, compare up to 3 quotes!
It's FREE and there are no obligations
Ask a Trade
Got a question that only a tradesperson can answer? We have thousands of trades ready to answer any question you may have.
Ask your question
Ask a Trade

Are you looking for advice on a DIY project or have a question for our tradespeople?

We'll email your question to tradespeople who are skilled in your chosen category.

Your question will be made public - please do not include any personal details.

{{ first(ask.errors)[0] }}

By continuing you agree to the Community Guidelines.

Report Content

{{ first(reportForm.errors) }}

Thank you

Your report has been created and will be investigated shortly.

Ready to get a price for your home improvement project?
Get started

Over 1 million homeowners and over 50,000 tradespeople
use MyJobQuote nationwide each year