another shed project question

Posted by on October 30, 2009, 1:41 pm

I have my shed almost finished.....I poured slab, then one row of concrete
blocks, and then built shed....It rained quite a bit last night and I
noticed some wetness at the mortar joint between slab and concrete blocks in
a couple of places along one wall only. the top of the slab is at least 4
inches above grade. I guess water is passing through mortar.......Do I
need to seal mortar joints somehow? any advise appreciated...

Posted by RicodJour on October 30, 2009, 1:48 pm

On Oct 30, 1:41=A0pm, cheapd...@home.com wrote:

> I have my shed almost finished.....I poured slab, then one row of concret=

> blocks, and then built shed....It rained quite a bit last night and I
> noticed some wetness at the mortar joint between slab and concrete blocks=

> a couple of places along one wall only. the top of the slab is at least 4
> inches above grade. I guess water is =A0passing =A0through mortar.......D=

o I

> need to seal mortar joints somehow? any advise appreciated...

Brush a couple of coats of cementitious waterproofing, such as
Thoroseal, on the outside of the block and lapping it onto the
concrete. It comes in gray/grey and white.

How much of a roof overhang do you have on the shed?

R

Posted by on October 30, 2009, 2:05 pm

The roof overhang is about 10 inches.

Posted by RicodJour on October 30, 2009, 5:06 pm

On Oct 30, 2:05=A0pm, cheapd...@home.com wrote:

> The roof overhang is about 10 inches.

That's reasonable for a shed. I was asking because I've seen quite a
few sheds where there is no overhang and the lower parts of the
building take a bigger beating from the weather over the years - they
rot more quickly.

R

Posted by Tony on October 31, 2009, 9:27 pm

RicodJour wrote:

> On Oct 30, 1:41 pm, cheapd...@home.com wrote:

>> I have my shed almost finished.....I poured slab, then one row of concrete
>> blocks, and then built shed....It rained quite a bit last night and I
>> noticed some wetness at the mortar joint between slab and concrete blocks in
>> a couple of places along one wall only. the top of the slab is at least 4
>> inches above grade. I guess water is passing through mortar.......Do I
>> need to seal mortar joints somehow? any advise appreciated...

>
> Brush a couple of coats of cementitious waterproofing, such as
> Thoroseal, on the outside of the block and lapping it onto the
> concrete. It comes in gray/grey and white.

Does that stuff stay flexible? I'm still having a problem with water
going under the block and mud and into the crawl space slab under the
house. Hydraulic Cement didn't work after a couple warm/cold cycles.

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