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Tag: concrete slab

Slab-on-Grade Foundations

What are the pros and cons of different foundation types?

Angela,

Thank you for the inquiry.

We are unique in this part of the country with most of our homes having basements. This was a “nod” to the concept of bringing the “root-cellar” into the home for easier access during long and cold winter months.

Because most of our surface soils or “over-burden” are clay soils, the likelihood of water/moisture infiltration in the house through the foundation floor is increased, so it would seem ..read more

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A Sinking Slab

I think my slab-on-grade addition is sinking. Is this a concern?

Barbara,

Thank you for the inquiry – we can appreciate your issues.

From what you describe, it sounds as though you have a “three-wall-bump-out” slab-on-grade foundation. In this process, they dug three trenches to form the three new foundation walls and filled them with concrete. The concrete foundations should have been placed on “undisturbed soils” to avoid future settling. They likely did not pour a new wall parallel with and adjoining the ..read more

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Sealing an Old Concrete Slab

Would an old concrete slab benefit from sealing?

Ron,

Great question – thank you.

Should you seal an old concrete driveway slab?

A sealer should help to keep the concrete from becoming saturated by surface water – and water-borne salts that can create problems for the concrete and for the soils supporting the slab. The short answer to your question is “yes”. Even older concrete can benefit from sealing.

Use of a “breathable” sealer that keeps surface water out, but lets sub-soil water and moisture ..read more

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How to Install Hardwood over Concrete

Can I lay hardwood over concrete floors?

DK,

Thanks for the inquiry – we appreciate it.

Concrete has a natural ability to absorb and transfer moisture while remaining dimensionally stable. This means the concrete itself will not change size and shape simply because all or part of it is wetted.

Wood has similar characteristics except that it may change shape when wetted, especially if the bottom only – the side laying on the concrete below – is wetted while the top remains dry.

For this ..read more

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Fixing a “Negative” Grade Foundation

Theresa,

Thank you for listening and for the great comments – we appreciate both!

If the property you are looking at has a “negative” grade – one that actually appears to direct water back toward the house, it can usually be corrected.

The issue that compounds this problem is that the house is a slab-on-grade construction.

This severely limits what you can do to resolve a potentially bad situation!

You should call Terry at Blessed Assurance Home Inspections before you commit to any home purchase. ..read more

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A Settling Slab

Danny,

Thank you for being part of the show – we appreciate you!

You are having a brand new home built and some settlement of your new garage floor slab has you concerned?

Should a new slab settle one inch or more and be un-level even as the home is being finished?

Absolutely not!

The native soils were excavated when the foundations were built and the resulting fill should have been a compacted, readily drained material such as sand or stone as a sub-base to ..read more

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