10 Edison Place, Bromley
Christchurch, New Zealand

Q&A

Underfloor ground sealers most FREQUENTLY ASKED QUESTIONS:

 

Q        

How long has Foam Concrete been around?

A

Foam Concrete has been available overseas for 50 years. Canterbury Foam Concrete has been producing Foamcrete in New Zealand since 1995

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Q        

How do I know Canterbury Foam Concretes ‘THERMOFILL™’ underfloor ground sealer will do what they claim?

A

The product and system is BRANZ appraised. https://www.branz.co.nz/Appraisal/961
The appraisal requires annual re-certification.

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Q        

How long does it take?

A

Canterbury Foam Concrete Ltd aims to get quotes out within a week after a site measure and jobs can normally be undertaken within a week of confirmation of a quote. On the day of installation a normal size house will start at 8 or 9am and be complete by early afternoon.

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Q        

How does Foam Concrete work?

A

Foam Concrete is very flowable (unlike conventional concrete) and covers the ground to form an effective vapour barrier. It is a totally inert product.

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Q        

Do you have to be able to get under the floor to install the concrete?

A

No. We can pump the concrete in usually through the vent locations. Manhole access can help though. We have even cut manholes for access for clients when no other access was available. If vents are or need to be removed, we allow to come back and reinstate them after pour day.

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Q        

Does Foam Concrete need a plastic film under it?

A

No. Foam Concrete can be pumped directly onto the ground.

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Q        

Do you cover the whole ground area under the floor?

A

Canterbury Foam Concrete Ltd endeavour to cover the total ground surface, but in some cases, depending on the shape of the house and the number of access points, this can be extremely difficult, especially if there is insufficient space to access the under the floor. In most cases we can cover 95% of the ground surface and this is sufficient to be effective.

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Q        

Do you fill the whole space between the floor and the ground?

A

No, we only cover the ground with a layer on average 50-75 mm thick. Unlike a house with a concrete floor, there is still an airflow between the concrete and the underside of the floor.

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Q        

What happens to existing pipes and wires under the floor?

A

Drainpipes and wires should be attached to the under side of the floor, but rarely are. Pipes aren’t affected if covered in Foam Concrete. Telephone wires should be raised above the concrete if possible. Canterbury Foam Concrete Ltd can do this work but can if requested for an extra charge.

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Q        

What if we have to get plumbing or electrical work done after installing Foam Concrete?

A

If there is sufficient space under the floor for a tradesman to work there is no problem and it is actually easier to work on the Foam Concrete surface than on the bare ground. If there is insufficient space for a tradesman then nothing has changed.