Porch Foundation Cross Section

[antsals]

Does anyone know where I can find a typical foundation cross section that I can follow to build a small porch slab. The walls are already part of the house, all I need to do is dig down and hardcore it, insulate, damp proof and then slab.

A good cross section would be great with typical depths.

Cheers
Ant

 

[tony1851]

Untitled

• tony1851
• 14 Mar 2013
• 1

 

[antsals]

Thanks for that....what about the makeup of the slab? How much hardcore, insulation, damp proof concrete? And in what order?

Cheers
Ant

 

[^woody^]

Please tell me that that drawing was done for Comic Relief

 

[tony1851]

Please tell me that that drawing was done for Comic Relief

You're correct; it was a bit under-spec'd.

 

[antsals]

Just going on from this one, a little more detail would be a great help.

Like I mentioned before where I want to create the porch I already have walls at each side and a roof above.

I guess I am best to dig down the the depth of the original foundation, pour concrete slab upto the original position. Then trench blocks, then blockwork above and facing brick the match original. How do I cut in into the original brickwork?

Then the slab hardcore, sand, 100mm thick kingspan insulation, plastic damp proof sheeting, then 100mm slab?

Does this sound correct? Anyone know where I can find a good cross section to follow?

Cheers,
Ant

 

[damanpunk]

Most insulation suppliers state they want their product above the DPM

 

[tony1851]

Your foundation spec appears more than adequate for something which will, in effect, only be supporting perhaps glazing and a door.

Why bother with insulation at all? - it will be a waste of money if the porch is not heated.