VOID FORM DECOMPOSITION
VOID FORM DECOMPOSITION
(OP)
Hey guys,
My office has recently installed a structural slab over expansive soil using a cardboard void form. Our drawings strictly state not to place a ground poly sheet (so the cardboard will breakdown) and we didn't catch that the contractor did happen to place a ground poly sheet. The slab has been poured already and now we are looking into ways we can get them to decompose the void form by coring multiple holes through the slab in certain locations....
Has anyone ever dealt with an issue similar to this?! If so, what solutions did you come across?!
Thanks in advance.
My office has recently installed a structural slab over expansive soil using a cardboard void form. Our drawings strictly state not to place a ground poly sheet (so the cardboard will breakdown) and we didn't catch that the contractor did happen to place a ground poly sheet. The slab has been poured already and now we are looking into ways we can get them to decompose the void form by coring multiple holes through the slab in certain locations....
Has anyone ever dealt with an issue similar to this?! If so, what solutions did you come across?!
Thanks in advance.






RE: VOID FORM DECOMPOSITION
Drill some holes and fill it with enough* water?
When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.
-R. Buckminster Fuller
RE: VOID FORM DECOMPOSITION
If it has sharp edges, there's a fair chance the plastic is already perforated.
Mike Halloran
Pembroke Pines, FL, USA
RE: VOID FORM DECOMPOSITION
RE: VOID FORM DECOMPOSITION
The whole point of the decomposing is to create an air void to allow for soil expansion beneath the slab so that heaving does not occur ( it is supported on piles). We have thought about water, but are scared that if we dump too much beneath the slab, the soil will become saturated and heave, which can potentially lead to cracking and movement.
The poly is laid above and below the voidform. The poly below the void is the main issue. Also we have a protection board over the void form, so the aggregate from the concrete will not come into contact with the poly ground sheet.
RE: VOID FORM DECOMPOSITION
RE: VOID FORM DECOMPOSITION
http://www.buildingscience.com/documents/insights/...
http://www.buildingscience.com/documents/published...
RE: VOID FORM DECOMPOSITION
I would think the cardboard would go first as it is really only intended to support the wet weight of concrete.
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RE: VOID FORM DECOMPOSITION
The specific brand of void form available here is designed to breakdown once moist creating a void space, as far as I understand. We were trying to find someone who can steam beneath the slab but are having a tough time tracking someone with the required tools down, which is why we are looking for alternative solutions.
RE: VOID FORM DECOMPOSITION
RE: VOID FORM DECOMPOSITION
RE: VOID FORM DECOMPOSITION