Foil & multifoil insulation installers in Cardiff

Cardiff's Roath, Cathays, Canton and Grangetown terraces — slate roofs, back additions, shallow rafters — are converted upward constantly; Rhiwbina and Whitchurch add the inter-war semis; Ely and Llanrumney the estates.

Welsh Building Regulations differ from England's in places, and the specification reflects that.

Cardiff's housing and what it means for insulation

Victorian and Edwardian terraces across Roath, Cathays, Canton, Grangetown and Splott — many with slate roofs and back additions — Edwardian villas in Pontcanna, inter-war semis in Rhiwbina, Whitchurch and Llanishen, post-war estates in Ely and Llanrumney, and 1990s–2020s housing in Cardiff Bay and Pontprennau.

Typical Cardiff enquiries

Terrace loft conversions in Roath, Canton and Cathays
Inter-war semi loft rooms in Rhiwbina and Whitchurch
Loft floor upgrades in Ely and Llanrumney
Slate-roof insulation and ventilation checks

Qualitative pattern from Cardiff's housing stock; replaced with aggregated, anonymised Cardiff enquiry data as it builds.

Older Cardiff terraces: shallow rafters and back additions

Roath, Cathays and Canton terraces have slate roofs, back additions and shallow rafters, and the specification is written to the Welsh Building Regulations, which differ from England's in places.

Older roofs can have significantly less usable insulation depth than modern constructions. Rafter dimensions, underlay type, ventilation and any rear or addition roof must therefore be checked at the property before a multifoil or hybrid build-up is specified. Where depth is limited, the usual investigation is multifoil under the rafters with battens forming the room-side air space; where a target U-value applies, PIR between the rafters is added. The party-wall junction and any existing damp staining decide whether the job is straightforward.

Coverage around Cardiff

Assessment and installation are allocated by postcode and project type across Cardiff and these surrounding areas:

Roath

Cathays

Canton

Pontcanna

Rhiwbina

Whitchurch

Llanishen

Penarth

Barry

Caerphilly

Llandaff

Radyr

We also cover Swansea, Newport, Wrexham and the rest of Wales.

How it works, briefly

Postcode → property questions → assessment where a physical inspection is needed → recommendation → fixed quote → installation. Every step runs to the InsulationMatch installation standard; the installing company is named on the quote. Multifoil itself is explained in the multifoil guide, and what moves a price in the cost guide. Local ranges are published here only once genuine Cardiff quotes exist.

Local projects

Documented Cardiff projects are added to the project library as they complete. Until then the library's typical project scenarios show how the housing above is assessed.

Questions homeowners ask

Do you install foil insulation in Cardiff?

Yes — assessment and installation capability covers Cardiff and the areas listed on this page, allocated by postcode and project type. The check tells you the coverage position before asking for contact details.

Do you cover Pontcanna?

Yes, Pontcanna is within the Cardiff service area. Enter the postcode and we confirm the position for that address.

My Cardiff roof has condensation — can it still be insulated?

Not until the cause is understood. The survey checks ventilation and timber moisture first; insulating over a moisture problem seals it in.

Can you survey a loft conversion in Cardiff?

Yes. A loft conversion assessment measures rafter depth and headroom, checks the ventilation path and existing insulation, and sets out the build-up with a target U-value before any quote.