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Thread: How to Fix Leaky Shed
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23rd March 2021, 06:57 PM #1
How to Fix Leaky Shed
Only a minor inconvenience compared to others along the coast at the moment, but still need to get it fixed. My shed (garage) is built from Besser blocks, which are very porous which get wet on the inside during heavy rain. With around 1m of rain over the past week I've had about 20mm of water on some parts of the floor around the walls.
If the rain ever stops & it dries out I will need to either paint it or apply some sort of sealant to the outside of the walls & am after any recommendations on a suitable product. TIA
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23rd March 2021 06:57 PM # ADSGoogle Adsense Advertisement
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23rd March 2021, 09:27 PM #2Senior Member
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This sort of stuff Crommelin 15L PRO-400 WP Roof And Wall Waterproof Membrane
we used a black tanking product looks brown in the tub but dried black, gluggy and sticky to apply but works a charm.
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23rd March 2021, 10:45 PM #3
Thanks for that wrongway, but I should have mentioned that there is around 130 sq metres of walls to be done & with that one covering between 1.6-4.8sq metres/L per coat, could get very expensive. Was hoping for something with more coverage/L. Also, if it's a dark colour I'll have to paint over with a light colour to keep the heat down.
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23rd March 2021, 11:00 PM #4GOLD MEMBER
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Have used this type of product to waterproof cracked concrete water tanks. Can't remember the exact brand or where I got it but it was in Melb. I don't think that the cost was exorbitantly high. You dilute it with water, brush it on the concrete and the leaks stop.
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24th March 2021, 08:12 AM #5SENIOR MEMBER
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When I built my first house in far north Queensland it was a priority to seal the besser bricks, the sealer was a clear silicone based product can't remember the name it was in the seventies and Im lucky to remember my name.
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24th March 2021, 08:59 AM #6
I have used clear silicone liquid as a sealer and it worked well.
Good luck
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24th March 2021, 01:17 PM #7
Any good quality exterior paint system will do the job well enough, and you can roll on another coat very quickly if you don't let it deteriorate too badly. The weakest link are the mortar joints and it sounds as though you have a lot of weak links at the moment!
There are a zillion blockwork houses in North Queensland, and it rains there a bit, so you can be assured that all the advice above re:slapping on a coat of something will work.
I would stay away from the silicone type seals mentioned above - while they do work as a water repellant, but are generally not noted for UV resistance and the first sign you get that they are breaking down is the damp appearing inside once again. As an added bonus - silicone is a "bit troublesome" to paint over should you wish to pretty up the place in the future.
A high-build type coating is a bit more expensive, but will last the distance. For a Rolls-Royce job that is "almost" set and forget have a look at something like Armour | Rockcote which you can get (along with reasonable advice) from your local Bunnings.
Cheers,
P
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24th March 2021, 01:30 PM #8GOLD MEMBER
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25th March 2021, 08:58 AM #9SENIOR MEMBER
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Sorry Beardy I haven't a clue as to what it was called only that it was very good as a clear sealer.
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25th March 2021, 06:37 PM #10
I had this problem at my previous house.
Brick and besser block building essentially have two built in defenses against water ingress:
- There is a damp course low down to stop rising damp - moisture rising from the surrounding soil, and
- There are air vents down low (just above the damp course) and up high, often into the roof cavity, which will promote airflow to dry any dampness from the wall cavities.
My small besser block shed was fine for ten years then quite suddenly it got mildewy - the parapet wall became constantly damp and water oozed onto the floor along it. A new neighbour had done some "landscaping" and piled soil about a metre high along the wall, way above the height of the damp course, had a watering system working frequently and our shaired wall acted as a sponge, leaking into my shed. He declined to remove the offending soil. The council said he should not have built the "berm" (threir word), but also declined to do anything - "Its a private matter". Lawyers at 50 paces????? A property we had long admired came on the market, so we bought it and moved.
First thing that I would do if I was in your position, Woollybugger, is check that there is nothing compromising the damp course including verifying that there is good drainage around all four walls of the shed, well below the damp course. Next I would check that air vents are not blocked so that there is a nice drying draft in the cavity.
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26th March 2021, 04:28 PM #11Woodworking mechanic
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On recommendations from a company that specialised in waterproofing, we used this product on a brick wall section of our house that is double brick but with no cavity. There are also no eaves so it cops a hammering. Water just beads off now.
FDFC202F-9858-421A-8DFF-EDE905F0D35A.jpg
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26th March 2021, 05:28 PM #12GOLD MEMBER
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26th March 2021, 05:51 PM #13Woodworking mechanic
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26th March 2021, 07:47 PM #14
Some good products here
Bondall Multi-Surface WaterprooferThe person who never made a mistake never made anything
Cheers
Ray
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26th March 2021, 09:03 PM #15
Thanks for the suggestions guys. The main problem with these is the $$$, with the suggested coverage I'm looking at $1500-$2000. I had a close look at the walls today & noticed some fine cracks between the blocks & the morter, so think I will probably need a thicker coating product, rather than the penetrating type. I think the shed is around 30 years old.
Would something like Berger Jet Dry paving paint work? Just to throw another nut tightening device into the works, one end wall is only 15-20m from the river, which is normally salt water.
20210326_160223 (1024x576).jpg DSC_0875 (1024x576).jpg
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