Room in Roof (RIR) Insulation Guide

Note: All installations must comply with current regulations, which may change over time.

Key considerations before installation

• Presence Required: Someone must be present during installation—either you or someone you trust.
• Disruption: The work may make certain rooms unusable temporarily.
• Space Impact: Insulation is fitted inside the property, slightly reducing floor area and potentially making rooms feel smaller.
• Wall Usage: You cannot drill or nail into insulated walls like normal ones. This risks trapping damp. Special fittings are available if you need to hang items.
• Ventilation: Upgrades are likely needed.

See our ventilation guide for more details. Ventilation | YES Energy Solutions

What Is Room in Roof Insulation (RIR)?

RIR involves insulating a room directly under the roof—typically a converted loft with windows, a staircase, and a door. It helps:

• Retain heat
• Reduce energy loss and carbon emissions
• Lower energy bills
• Improve comfort

Materials used:

• Rigid boards between rafters
• Foil layers for improved performance and moisture control (vapour barrier)
• Mineral wool for filling gaps
• A vapour barrier prevents moisture from entering the roof structure.

Common misconceptions & FAQs

“I already have loft insulation—isn’t that enough?”

• No. Standard loft insulation isn’t suitable for habitable rooms and may lack proper fire and thermal protection.

“Does insulation cause damp and mould?”

• No. Proper installation and ventilation prevent condensation and moisture buildup.

“Does insulation only work in cold weather?”

• No. It slows heat transfer, keeping warm air in during winter and cool air in during summer.

“Is more insulation always better?”

• Not necessarily. Too much insulation without ventilation can cause moisture issues. The retrofit coordinator will assess the right amount.

“Is insulation a fire hazard?”

• No. Materials are fire-retardant and installed to meet safety regulations.

“Only new homes can be properly insulated.”

• False. Existing homes can be insulated effectively and often more affordably.

Installation process

Before Installation

Surveys will assess:

• Area measurements
• Best insulation type
• Ventilation needs (may include air pressure tests)
• Electrical requirements
• Storage: You must clear the area. If needed, contractors can assist.

During Installation

• Final checks to ensure the area is ready

Installation steps:

• Rigid boards fitted between rafters/studs
• Foil layer added for vapour control
• Short walls and loft space insulated
• Plasterboard applied, ready for decoration
• Minor electrical work for ventilation systems

After Installation

• Quality checks completed
• Area cleaned and tidied
• Redecoration not covered by grants—walls will be ready for painting or wallpapering
• Items removed from walls will be replaced

Maintenance Tips

• Avoid drilling or nailing into insulated walls—this can damage the vapour control layer.
• Use specialised fittings for wall-mounted items.
• Inspect roof and attic space twice a year (spring and autumn).
• Watch for signs of water damage (leaks, stains, mould).
• Check roof surface for wear and tear.
• Keep gutters and downspouts clear and functional.

Handover Documents

After installation, you’ll receive:

• Trustmark Certificate
• Electrical Installation Certificate
• Insurance-Backed Guarantees
• Building Regulations Certificate (or proof of competent persons scheme)
• Claim of Compliance
• Workmanship Guarantee
• Manufacturer’s Warranty