Re-insulating Your Loft After Spray Foam Removal in Liverpool

Why re-insulating matters

Spray foam on the rafters was doing the insulating. Once it has gone, unless there is good mineral wool already on the loft floor, heat from the rooms below escapes straight up into the roof. In winter that means colder bedrooms and higher heating bills. Re-insulating straight after loft spray foam removal closes that gap, and it is something lenders and buyers will expect to see in a house that has had foam taken out.

It also matters for the roof. Insulating at the loft floor rather than the roof slope keeps the roof space cool and ventilated, which helps timbers stay dry. That is the opposite of what foam on the rafters did, and it is one of the main reasons people choose removal over leaving foam in place.

Cold roof or warm roof, in simple terms

Spray foam on the rafters turned many ordinary lofts into a kind of improvised warm roof, often without the ventilation and vapour control a proper warm roof needs. For most houses we re-insulate as a cold roof. If your loft has been converted into a room, the approach is different and we will talk it through with you.

What re-insulating involves

• Mineral wool at joist levelA first layer between the joists, then a cross layer over them to reach around 270 mm in total.
• Eaves kept clearInsulation stops short of the eaves, or eaves trays or vents are fitted, so air can flow under the roof.
• Raised boardingIf you need storage, boards sit on raised legs above the insulation rather than squashing it.
• Breathable choicesWhere a breathable membrane or roof covering is involved, we keep the roof space vapour-open and well ventilated.
• Hatch and pipesThe loft hatch is insulated and draught-sealed, and pipes and tanks in the cold loft are lagged.
• Around fittingsGaps are left around recessed lights and flues as needed, and cables are not buried where they could overheat.

Signs your loft needs re-insulating

• Spray foam has just been removed, or is about to be.
• Old insulation has been taken out because it was damp, flattened or soiled.
• The existing mineral wool is well short of 270 mm or patchy.
• Boards were laid straight on the joists, crushing whatever insulation is underneath.
• Rooms below feel cold or you notice condensation on bedroom ceilings in winter.

If old mineral wool needs clearing first, see our loft insulation removal service.

Our re-insulation process

1. Check the roof is ready. Timbers should be dry and any felt, batten or tile repairs done by a roofer before new insulation goes down.
2. Plan storage and access. We agree where you need raised boarding and walkways, and where the loft can be insulated to full depth.
3. Clear the eaves. We make sure ventilation routes at the eaves are open and fit trays or vents where needed.
4. First layer. Mineral wool is laid snugly between the ceiling joists with no gaps.
5. Cross layer. A second layer goes across the joists to reach around 270 mm overall.
6. Boarding and hatch. Raised boarding is fitted where agreed, and the hatch is insulated and sealed.
7. Record it. We note the insulation type and depth for your records, which helps at a future sale.

Re-insulating Merseyside homes

Older terraces often have shallow lofts and low eaves where getting full depth without blocking ventilation takes some planning. Bigger inter-war and post-war homes in places like Kirkby and Widnes usually have more room, but often need raised boarding for family storage. In exposed coastal spots and in parts of the Wirral, good eaves ventilation helps the roof cope with damp, windy weather. Our spray foam removal and re-insulation service covers the whole of Merseyside. If a sale or remortgage is involved, our page on spray foam and mortgages covers what paperwork to keep.

What affects the cost of re-insulating?

• The loft floor area and how much existing insulation can be kept.
• Joist depth and spacing, which affects the materials needed.
• How much raised boarding you want for storage.
• Eaves trays, vents, hatch insulation and pipe lagging.
• Whether it is done in the same visit as foam or insulation removal.

See our spray foam removal cost guide for how the full job is usually priced.

When to call a professional

Call us when foam is coming out, when you have just had it removed by someone else and the loft is bare, or when your existing insulation is thin or crushed. Getting ventilation, boarding and depth right matters for both warmth and the health of the roof. Our team for spray foam removal in Merseyside can plan it all as one job.