Drainage above Garage Damp Course

[J_N30]

Hello.

My garage and house are 1 meter apart but the house is higher. My current patio is 2 bricks below the house damp Proof course and I want to extend the patio along the garage. Now, I'm going to add channel drainage along the house and garage but the drainage is going to be 1 brick above garage damp course.

How much of a problem is this going to be? I've included a picture below.

 

[noseall]

You will run the risk of rain splashes soaking the masonry above the dpc.

Not a problem if...

The bricks and mortar above dpc are ffl rated.

There is a cavity wall arrangement with a decent sub-dpc trough.

There is a lot of overhang off the house and garage.

Alternatively, you could chop in a run of lead flashing along the abutment to deal with the splashes. This would need to finish 150mm above the paving and say 25mm below the slab top.

 

[J_N30]

Thanks for your reply. Directly above is the over hang from the garage roof so i dont think rain splashs would be a problem.

Seams it will have plastic drainage against the brick can i rule out rising damp?

would you advise fitting the flashing anyway?

Many thanks.

 

[J_N30]

The more I think about it the more I think I should add some flashing.

Instead of grinding the mortar out, sliding flashing in and re pointing could I just sit the flashing flush up the wall and silicone the top edge to the wall?

Sorry for another question, could I just paint this up the wall?

http://m.wickes.co.uk/mt/www.wickes...t/241217/?un_jtt_v_un_details_tab=tab_reviews

 

[J_N30]

Sorry to push on this guys, but any thought on my questions. I hope to make a start on this tomorrow but not sure on the best method to take.