Contiguous & Secant Piling Spray Foam Insulation
Insulate and waterproof contiguous and secant piled basement walls — spray foam follows the uneven pile faces no board can. Installed UK-wide.
Why spray foam for piled walls
Basement retaining walls formed from contiguous or secant piling present a uniquely awkward surface. The pile faces are irregular and ribbed, with gaps, projections and an uneven concrete profile that no rigid board can follow. Below ground, these walls are a major cold bridge into the basement, and the cold, damp internal face readily forms condensation — a serious problem for occupied or fitted-out basement levels.
Enverge closed-cell spray foam is applied straight onto the raw pile faces, expanding into every flute, gap and projection before curing rigid. It self-bonds to the concrete piling as it sets, with no need to first build a flat substrate to fix boards to. The continuous, contour-following layer insulates the wall and seals its surface, breaking the below-ground cold bridge and keeping the internal face dry.
The result is a basement retaining wall that no longer drives condensation or heat loss, with a sealed, insulated face ready for the planned internal build-up. It removes the cost and lost floor space of framing out a flat surface, and turns an irregular, cold, damp-prone piled wall into a controlled, dry thermal envelope.
The benefits for piled walls
Seals Irregular Piles
Expands into the flutes, gaps and projections of contiguous and secant pile faces that boards can't follow.
Breaks Below-Ground Bridge
Insulates the buried retaining wall, cutting the cold bridge that chills fitted-out basement levels.
Dry Internal Face
Low-permeability foam keeps the cold piled wall dry, stopping condensation on occupied basements.
No Flat Substrate Needed
Self-bonds straight to raw piling — no framing-out to create a surface for fixing boards.
Saves Floor Space
A thin bonded layer follows the wall instead of a framed build-up that eats into basement area.
Handles Ribbed Profiles
Continuous application copes with the uneven, ribbed concrete typical of piled retaining walls.
Follows the pile profile
Foam sprays directly onto the uneven pile faces, sealing and insulating the below-ground wall completely.
Applied directly to raw contiguous or secant pile faces, Enverge closed-cell foam expands into the ribbed, irregular profile and cures rigid, self-bonded to the concrete. Its low-permeability closed-cell structure insulates the below-ground retaining wall and seals its surface, breaking the cold bridge and keeping the internal face dry ahead of the basement's internal build-up.
- Bonds direct to raw, ribbed pile faces
- 25-year manufacturer-backed warranty
- Keeps cold below-ground walls dry internally
- No framing-out — saves basement floor space
Enverge Nexseal LE — verified performance
Typical published values for Enverge Nexseal LE closed-cell foam. Full technical specification →
Specification & compliance for piled walls
Below-ground and underfloor spaces are hostile to boards: irregular pile faces, tight crawl voids and damp-prone surfaces leave gaps everywhere. Sprayed closed-cell foam is applied at 25–100 mm directly onto the irregular surface — sheet piling, retaining walls, blockwork or floor joists — sealing cold bridging and carrying its own vapour barrier.
Because the applicator sprays in-situ, compromised voids that could never be boarded out are insulated completely, sealing draughts up into the building and bringing the below-ground envelope up to specification in a single visit.
From enquiry to warranty
Enquire
Tell us about your piled walls & building.
Survey
Free survey of your piled walls & condensation check.
Specify
The right system for your piled walls.
Install
Approved applicators, minimal disruption.
Warranty
Handover pack & 25-year warranty.
Real piled walls spray foam applications
Commercial projects
Richmond House Car Park
Underside of a car-park deck sealed and insulated in-situ.
The Box, Plymouth
Concrete soffit spray foam eliminating cold-bridging.
RBW Carpentry
Cavity-filling spray foam for an airtight commercial partition.
Get a quote for your project
Send us your building details and our technical team will specify the right system and a clear budget. No obligation.
Piling insulation, answered
Can spray foam be applied directly to contiguous or secant piled walls?
Yes. Enverge closed-cell foam is sprayed straight onto the raw pile faces, expanding into the flutes, gaps and projections and self-bonding to the concrete as it cures. There is no need to first frame out a flat substrate, so it suits the irregular profile of piled walls.
Does it stop condensation on a cold basement retaining wall?
Yes. Piled basement walls are a below-ground cold bridge, and their cold internal face readily condenses. The low-permeability foam insulates the wall and raises its surface temperature, keeping the internal face dry — important for occupied or fitted-out basement levels.
Will it save floor space compared with a framed insulated lining?
Generally yes. Because the foam bonds straight to the irregular piling and follows its contours, you avoid framing out a flat surface for boards, which would otherwise project further into the room. A bonded foam layer keeps more usable basement floor area.
Is it suitable for below-ground, damp environments?
Closed-cell foam is low-permeability and resists moisture, making it well suited to the cold, damp conditions of a basement retaining wall. It should be specified as part of a wider basement waterproofing and build-up strategy, which we coordinate with the design team.
What internal finish can follow the sprayed insulation?
The cured foam provides a sealed, insulated face ready for the planned internal build-up — for example an independent lining or finishing system. We coordinate the foam application with the basement's waterproofing and fit-out design so the following trades have a sound base.
Can you insulate a void with very restricted access?
Usually yes — spray application needs far less working room than boarding out, and the foam seals surfaces boards can't reach.
Does below-ground foam need a separate vapour barrier?
No — closed-cell foam has an integral vapour barrier, one of the reasons it's specified below ground.
What depth is used below ground?
Typically 25–100 mm depending on the target U-value and the structure — specified after survey.
Insulate your piled walls the right way
Specialist commercial spray foam, installed UK-wide by the Duratite Group's spray foam specialists.
Book a Free Survey →or call 01208 832 602