When the old covering is stripped from a roof, the structure is open, and that is the easiest time to think about insulation. A new roof is a big job, and adding or improving insulation while the work is under way can be simpler than going back to it later.
Why the timing helps
With the covering off, there is access to the rafters and the roof space from above. Insulation can be fitted between or over the rafters, or any existing insulation can be checked and topped up, without having to work around finished ceilings. That access disappears once the new roof is complete.
Ventilation matters as much as insulation
Adding insulation without thinking about airflow can cause problems. A roof space needs ventilation so that moist air from the house does not condense on cold timbers. Eaves ventilation, ridge vents and the way the underlay is chosen all play a part. A good roofer will look at the whole build-up rather than just adding a layer of material.
What to ask your roofer
It is sensible to ask what insulation is already in the roof, whether it is in good condition and how the new roof will be ventilated. If the house has a room in the roof or a loft conversion, the details are different and need more care. We look at the way the roof is built and talk you through the options at the quotation stage.
Think about the building regulations
Replacing a roof covering is work that can involve building regulations, including requirements about thermal performance in some cases. Your roofer should be able to tell you whether your job is affected, and the local council's building control team can confirm if you are unsure.
If you are planning a new roof and want advice on insulation and ventilation, see our New Roof Installations section or call us on 07766 547309 for a free quotation.
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