We erect scaffolding and remove tiles/slates.
Restore your roofRetain your Space, Reinforce your Comfort
Is your roof leaking heat—or just looking a little worse for wear? Retrofit roof insulation solves both problems in one go.
Whether your insulation is outdated or your slates are slipping, our spray-applied foam gives you a stronger, warmer, and better-sealed roof—without a costly re-roof.
What Is Retrofit Roof Insulation?
Retrofit insulation is a modern upgrade for older roofs. Even if you already have ceiling-level insulation, our closed-cell spray foam acts as a powerful second layer—slowing heat loss by up to 60% and helping your home retain warmth for longer.
The foam is sprayed from the outside, meaning minimal disruption inside your home. No mess, no fuss—and no loss of loft space. Once finished, your roof will look as good as new, but will perform far better.
Benefits of Closed-Cell Biofoam Insulation
Retrofit spray foam is especially effective in older homes where roof structures may be under strain or where attic insulation alone is not cutting it.
- Strengthens roof structure by over 30%
- Prevents tile or slate slippage
- Superior airtightness and soundproofing
- Faster, cleaner, and more cost-effective than a full re-roof
- Invisible finish – no visible insulation inside the attic
A Note on Spray Foam Safety
Spray foam insulation has made headlines in recent years—but not always for the right reasons. Some reports have raised concerns, particularly around mortgages and roof ventilation. These issues stem from incorrect foam types being used or poor installation methods that don’t follow regulation.
At Complete Insulations, we only use approved spray foams installed by fully trained and certified technicians. For retrofit roofs, we use closed-cell spray foam specifically designed for exterior application. It doesn’t interfere with internal ventilation systems or roofing breathability—and because it’s applied from the outside, there’s no risk of trapped moisture or fume exposure inside the home. We follow all Irish and UK building regulations and issue documentation for your records.
When installed properly, spray foam is safe, effective, and fully compatible with home resale and mortgage requirements.
Ideal for Attic Conversions
Thinking of converting your attic? Retrofit roof insulation is the perfect start.
Applied between the rafters, it helps turn a cold, draughty loft into a warm, usable space—ideal for a home office, studio, playroom, or guest bedroom. It also allows for slimline insulation, helping you preserve ceiling height and maximise comfort.
Find out more about our attic conversions service.
Retrofit Insulation for Flat Roofs
Flat roofs are prone to leaks, draughts, and poor insulation. Spray foam solves all three problems at once, providing a seamless seal against heat loss and moisture.
We recommend retrofit spray foam for:
- Bay windows and dormer roofs
- Lean-to roofs (front, back, or side)
- Draughty porch or extension roofs
- No disruption all the work is external
- Typical 100mm Unilin Insulation fixed to plywood or existing Flat Roof
- Most jobs completed in 1-2 days
- Finishes include Torch on Felt and Trocal
Installation – What to Expect
There’s no internal mess, no lingering smell, and no disruption to daily life. Most installations take 2–5 days, weather depending. Once done, your roof will be better insulated, stronger, and ready for all seasons.
All the work takes place outside your home:
Book Your Free Roof Assessment
Upgrade your insulation without the cost of a new roof.
Get in touch today to book a free consultation and find out how retrofit spray foam can make your home warmer, quieter, and more energy-efficient.
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