What should you assess first?
Four checks separate a possible simple loft opportunity from work that needs a broader building assessment.
Find the safe next assessment.
If you are unsure whether damp is condensation, rain penetration, plumbing or ground moisture, treat the cause as unknown and obtain independent diagnosis.
Complete the four checks
This is a planning triage, not a survey or moisture assessment.
Loft insulation: often the simplest start
Where the loft is accessible and dry, topping up insulation can be relatively low-disruption. Eaves ventilation, water tanks, pipework, electrical cables and safe storage platforms all need attention. More material is not automatically better if airflow is blocked.
Cavity walls: survey the exposure
Wall age is only a clue. A competent survey should establish whether a cavity exists, whether it is clear and whether the building’s exposure, defects and moisture condition make the proposed system suitable.
Solid walls: treat the building as a system
Internal and external wall insulation change temperature and moisture behaviour. Junctions, floors, roofs, windows, rain exposure and ventilation need a coherent design. This is not a sensible place to rely on a quick sales survey.
Older homes need a moisture strategy
If the property is historic, listed, solid-wall or already affected by damp, seek independent building-physics or conservation advice before selecting a system.
What an insulation quote should show
- Existing construction, defect and moisture findings.
- The exact insulation system, thickness and target performance.
- How ventilation, eaves, cavities and thermal bridges are handled.
- Preparation, making good and protection of services.
- Certification, guarantees and the route if performance is poor.