The slab is post-tensioned, or has heating in it
“We were told the slab is post-tensioned and cannot be drilled anywhere.”
Post-tension slabs contain steel cables under high tension. Cutting one is a serious structural matter, so coring locations must be established before any work.
In-floor heating presents a similar constraint for different reasons: the pipe or cable layout determines where a core can safely go.
Why this matters
What it changes about the decision in front of you.
- Sub-slab depressurization normally requires coring the slab, and both features restrict where that can happen.
- Locating cables or pipes usually requires scanning, which is an added step rather than a guess.
What it could influence
Where the effect is likely to show, and in which direction where that is knowable.
- A design may need exterior routing or fewer suction points than would otherwise be chosen.
- The scanning step adds time and cost to the assessment, which is legitimate rather than padding.
What this does not settle
What still stands. Noticing a problem is not the same as losing the evidence.
- Neither feature makes mitigation impossible — both are worked around routinely by people who scan first.
- It does not mean the slab cannot be cored at all; it means locations have to be established.
- It does not establish that a different method is required, only that this one needs care.
What a professional is likely to ask
Worth having answers ready. None of these is a test you can fail.
- Whether the household has construction drawings, which occasionally survive.
- Whether the slab has been cored before and by whom.
- Whether the heating layout is documented.
What you can check yourself
Things you can establish today, without anyone visiting.
- Whether there is in-floor heating, which the household generally knows.
- Whether there is any documentation from construction or a prior owner.
- Whether a manifold is visible that would indicate the heating layout.
What genuinely needs somebody on site
Where this platform stops. These are not questions a website can answer about your house.
- Where cables or heating runs actually are, which requires scanning equipment on site.
- Whether a safe coring location exists in a useful position.
Categories a next step could fall into
Unordered, and none of them is a recommendation. Which applies depends on things this page does not know about your situation.
Related reading
- What makes a great system — Six design choices that decide whether a system performs for a decade.
- Cost drivers — Seven variables that explain nearly every price difference.
Sources
- U.S. EPA — Consumer’s Guide to Radon Reduction
When you are ready to talk to somebody
Tell us about your home and what you are trying to work out. We will tell you honestly whether we can route it to a provider in your area today.