A safety valve that releases pressure if a heating or hot water system becomes over-pressurised.
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Planning Permission
Formal consent that may be needed for some external changes, such as external wall insulation, solar panels in sensitive areas or alterations to listed buildings.
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PIR Insulation
Polyisocyanurate insulation board. A rigid foam board commonly used in walls, floors and roofs.
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Photovoltaics
Solar panels that generate electricity from daylight.
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Phenolic Insulation
A rigid insulation board with good thermal performance for its thickness.
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Perimeter Insulation
Insulation installed around floor edges or foundations to reduce heat loss at junctions.
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Penetrating Damp
Moisture entering through the building fabric, often due to defects such as failed pointing, cracked render, roof leaks or blocked gutters.
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Peak Load
The highest heating demand expected during very cold conditions.
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Party Wall
A wall shared between two properties. It may need consideration during insulation, airtightness or ventilation works.
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Party Wall
A wall shared between two properties. It may need consideration during insulation, airtightness or ventilation works.