Spray Foam Insulation in Ireland
Upgrade your attic thermal efficiency. Learn the critical rules of open-cell foam, understand lender requirements, claim SEAI grants, and find verified installers.
Understanding Spray Foam in Irish Attics
Spray foam insulation has become a popular choice for insulating pitched roofs and attics in Ireland. Applied as a liquid, it expands rapidly to seal gaps, drafts, and hard-to-reach areas. However, because it is applied directly to timber rafters, strict material and ventilation standards must be met to protect your home's roof timbers.
In Ireland, residential timber roofs should only be insulated using **open-cell spray foam**. Open-cell foam is breathable, allowing moisture vapour to escape. If you use closed-cell foam, moisture will get trapped behind the dense barrier, leading to rot and structural timber damage over time.
Lender & Survey Guidelines
Irish banks and surveyors are strict about spray foam. If you buy, sell, or remortgage a home with spray foam, you must show an **NSAI Certificate of Compliance to I.S. 462**. The installer must also leave a 50mm ventilation gap behind the foam (usually achieved using temporary baffle boards) to keep roof timber dry.
Open-Cell vs. Closed-Cell Spray Foam Comparison
| Feature | Open-Cell Foam | Closed-Cell Foam |
|---|---|---|
| Breathability | High (Vapour permeable) | None (Vapour barrier) |
| Structure | Soft, flexible, light | Rigid, dense, structural |
| Residential Roof Use | Yes (Compliant with I.S. 462) | No (Timber rot hazard) |
| Lender Approval | Approved (With NSAI certification) | Rejected (Causes mortgage failures) |
| Typical Costs (3-Bed Semi Attic) | €1,800 - €3,200 | €3,500 - €5,000+ |
Spray Foam Insulation Costs & Grants
EWI and standard attic insulation grants can be applied to spray foam if the installation is completed by an SEAI-registered contractor.
Attic Grant Rates
- • Apartments: €1,200
- • Mid-Terrace Houses: €1,200
- • Semi-Detached Houses: €1,300
- • Detached Houses: €1,500
Calculate Your Savings
Check how much your net out-of-pocket costs will be by choosing Attic Insulation on our main calculator page.
Find Vetted Roof & Insulation Contractors
Browse our verified directory listings to connect with registered insulation professionals:
Get Free Spray Foam Quotes
We'll connect you with 3 certified, I.S. 462 compliant spray foam contractors in your area to compare quotes.
What's included in your
Guidance Package:
We've consolidated everything you need to navigate the retrofit journey without the stress of searching multiple government portals.
Eligibility Checklist
Instantly verify if your home and property type qualify for the 2026 grant schemes.
Application Portal Access
Direct, secure links to the official SEAI Online Portal to start your claim today.
Official PDF Forms
Downloadable Homeowner Application forms for your records and offline planning.
Verified Installer Shortlist
A curated list of high-performing, SEAI-registered trade professionals in your county.
Maximisation Tips
Insider advice on how to stack multiple grants to reach the maximum €39,250 in savings.