Sealing Around the Base of a Shed

by Barry
(Australia)

I'm erecting a small used shed on a concrete slab 2m x 2m which requires water proofing around the bottom edges before I use dynabolts to secure it to the concrete.

What would you recommend I use as a water resistant barrier. I have been told that mastic is good, so what do you you say about that.

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Sealing Around the Base of a Shed

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Thanks
by: Barry

Hi John,

Thank you for your advice, I'll give it a go and let you know how successful I was.

Many thanks Cobber,

Barry.

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Sealing a Shed Base
by: John - Admin

Hi Barry,
The advice you received about using the mastic sealant is correct. Make sure that you use a silicon sealant for external use with concrete and metal. A typical silicon mastic will state that it will 'cure to give a permanently elastic weatherproof seal with excellent durability and resistance to U.V light.'

Although it says this most mastic sealants do lose their grip and also become less flexible over the the years. The way to avoid this becoming a problem with your shed is to make sure that the concrete base does not protrude too far beyond the wall of the shed. The typical advice here I think is that the size of the base should go an inch or two beyond the wall on each side. This gives a very small area for any water to collect.

Let me know how you get on.

Cheers

John

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