space between under my deck and my house.

[JKW]

Hello.

I have a 3 inch gap between my house and yard, which runs along the width of the house, under my deck. Under my deck is a lot of gravel and dirt.   I noticed there was previous water damage from the previous owners time and it seems to be the location in the basement of efflorescence.   Is there something i can pour in the gap to stop the rain and water from snow melting continuously getting down there.

Many Thanks.

JW

[Jim Katen]

How about bentonite cat litter? 

When dry, it'll flow like sand all the way to the bottom of the void. Once it gets wet, it'll swell up and serve as a decent water barrier. 

[JKW]

Thank you for your reply. I will look into that.

[zafarkhan987]

  On 1/5/2021 at 1:30 AM, JKW said:

Hello.

I have a 3 inch gap between my house and yard, which runs along the width of the house, under my deck. Under my deck is a lot of gravel and dirt.   I noticed there was previous water damage from the previous owners time and it seems to be the location in the basement of efflorescence.   Is there something i can pour in the gap to stop the rain and water from snow melting continuously getting down there.

Many Thanks.

JW

Expand  

You can fill the gap with hydraulic cement or polyurethane sealant to prevent water infiltration. Adding a drainage solution like gravel and a French drain can also help redirect water away from your foundation. Consider extending your downspouts too. Hope this helps! 👍