External Insulation - On basement

bauderline

I have heard that a local Architect is planning to use external insulation on his basement, which will be below ground, surely this would not work very well ?!

Anyone ever heard of this being done ?

Best regards, B.

sas

I've seen it done on grand designs. They just tanked the outside of the insulation to keep it waterproof.

Why don't you think it would work?

sydthebeat

bauderline wrote: »

I have heard that a local Architect is planning to use external insulation on his basement, which will be below ground, surely this would not work very well ?!

Anyone ever heard of this being done ?

Best regards, B.

yes, one way of insulating a basement is to insulate external to the concrete structure.
It just means the waterproof material is external to the insulation with some kind of protection over. its not all that unusual.

similar to below.
http://www.safeguardeurope.com/cad_drawings/G-XV-VAND-001.pdf

bauderline

Thanks !

I just did not think that the insulation was designed to be used in this way and there might be some issues....

Now I know differently I will investigate further !

Thanks guys.

Baud.

Mellor

As long as it remains dry there is no issue, the same as external on a house.
But he should be careful ofthe junctions, as in how does the external basement insulation meet the wall insulation and the floor insulation

250882

There is a system called Dow(i think) I used it on a project before but its main purpose was to provide protection for the waterproofing layer. 120mm thick it was grooved with a mesh on the outside so it acts as drainage aswell.

Mellor

Similar to Delta membranes?

blackiebest

'Dow' and 120mm thick? Surely this is the insulation and could it be 'Dryvit' meshed outside and rendered with a waterproof material and then waterproof membrane?

B

Mellor

I think blackie is right,

This is Dryvit,
http://www.dryvit.com/fileshare/doc/us/description/ds446.htm

Dryvit Drainage Mat is a flexible, thermally pre-formed, in a zigzag configuration, mat made of polyamide and produced in a pale blue color for identification. The product is packaged in a 990 mm (39") by 76 m (250 ft) roll and is approximately 3.2 mm (1/8") thick. Dryvit Drainage Mat is used to create a drainage plane for the Residential MD and Sprint MD Systems

This is Dow,
http://www.dow.com/styrofoam/lowes/projects/basement.htm
Basically a product similar to kingspan.

foamcutter

I used it on a project before but its main purpose was to provide protection for the waterproofing layer

As 250882 said, but it also resists water penetration making it suitable for use underground. This info is from their site:
"Closed Cell Foam Structure – Foam with no holes or voids that water can penetrate. It resists moisture and will maintain its R-value over time. The result, high compressive strength and unparalleled resistance to water penetration."