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Deep retrofit ยท Muswell Hill, London

An Edwardian Deep Retrofit

Most of the work on this one is the part nobody sees. Finsa SuperPan airtight boards went onto the ceiling rafters and were taped with Pro Clima tape, junctions at the floor joists were sealed, a liquid airtight membrane was brushed where tape could not reach, and grommets went round every drainage penetration.

Sockets sit on Phonotherm structural insulation board so they can be fixed securely without punching through the insulation line. Then the walls: battens first, then Diathonite Evolution lime-cork-clay plaster sprayed in layers to reach the thickness needed, levelled off by hand. There is also an unused window blocked up in matching brick and a new suspended floor structure, both done while the house was open.

Photograph EnerPHit project in Muswell Hill, high level of insulation and airtightness work with some structural alterations EnerPHit project in Muswell Hill, high level of insulation and airtightness work with some structural alterations
02Preparation works for internal wall insulation in Muswell Hill, LondonPreparation works for internal wall insulation in Muswell Hill, London

Preparation works for internal wall insulation in Muswell Hill, London

03Blocking an unused window with matching bricksBlocking an unused window with matching bricks

Blocking an unused window with matching bricks

04New structural timber beams being installedNew structural timber beams being installed

New structural timber beams being installed

05New suspended floor structure being installedNew suspended floor structure being installed

New suspended floor structure being installed

06New suspended floor structure being installedNew suspended floor structure being installed

New suspended floor structure being installed

07Phonotherm Structural insulation board installed behind, socketsPhonotherm Structural insulation board installed behind, sockets

Phonotherm Structural insulation board installed behind, sockets

08Phonotherm Structural insulation board installed behind sockets in Muswell Hill, LondonPhonotherm Structural insulation board installed behind sockets in Muswell Hill, London

Phonotherm Structural insulation board installed behind sockets in Muswell Hill, London

09Socket boxes installed onto Phonotherm structural insulation boardsSocket boxes installed onto Phonotherm structural insulation boards

Socket boxes installed onto Phonotherm structural insulation boards

10Finsa SuperPan Airtight vapour barrier racking boards installed onto ceiling raftersFinsa SuperPan Airtight vapour barrier racking boards installed onto ceiling rafters

Finsa SuperPan Airtight vapour barrier racking boards installed onto ceiling rafters

11Finsa SuperPan Airtight vapour barrier boards taped around with ProClima airtightness tapeFinsa SuperPan Airtight vapour barrier boards taped around with ProClima airtightness tape

Finsa SuperPan Airtight vapour barrier boards taped around with ProClima airtightness tape

12Finsa Airtight vapour barrier racking boards taped with ProClima airtightness tape in Muswell Hill, LOndonFinsa Airtight vapour barrier racking boards taped with ProClima airtightness tape in Muswell Hill, LOndon

Finsa Airtight vapour barrier racking boards taped with ProClima airtightness tape in Muswell Hill, LOndon

13Airtightness taping around floor joists at wall-floor junctionsAirtightness taping around floor joists at wall-floor junctions

Airtightness taping around floor joists at wall-floor junctions

14Airtightness taping around floor joists - making junctions airtight in Muswell Hill, LondonAirtightness taping around floor joists - making junctions airtight in Muswell Hill, London

Airtightness taping around floor joists - making junctions airtight in Muswell Hill, London

15Airtightness work around floor joists using Aerosana Visconn fibre airtight liquid membrane in Muswell Hill, LondonAirtightness work around floor joists using Aerosana Visconn fibre airtight liquid membrane in Muswell Hill, London

Airtightness work around floor joists using Aerosana Visconn fibre airtight liquid membrane in Muswell Hill, London

16Airtightness works using Pro Clima Roflex Solido Airtight Grommet around drainage outlet in Muswell Hill, LondonAirtightness works using Pro Clima Roflex Solido Airtight Grommet around drainage outlet in Muswell Hill, London

Airtightness works using Pro Clima Roflex Solido Airtight Grommet around drainage outlet in Muswell Hill, London

17Battens are being installed in preparation for internal wall insulationBattens are being installed in preparation for internal wall insulation

Battens are being installed in preparation for internal wall insulation

18Battens are being installed in preparation for internal wall insulationBattens are being installed in preparation for internal wall insulation

Battens are being installed in preparation for internal wall insulation

19Battens are being installed in preparation for internal wall insulationBattens are being installed in preparation for internal wall insulation

Battens are being installed in preparation for internal wall insulation

20Battens ready for internal wall insulationBattens ready for internal wall insulation

Battens ready for internal wall insulation

21Diathonite Evolution lime-cork-clay insulating plaster-render spray machineDiathonite Evolution lime-cork-clay insulating plaster-render spray machine

Diathonite Evolution lime-cork-clay insulating plaster-render spray machine

22Diathonite Evolution lime-cork-clay insulation plaster being applied with spray pump onto solid masonry walls as internal wall insulationDiathonite Evolution lime-cork-clay insulation plaster being applied with spray pump onto solid masonry walls as internal wall insulation

Diathonite Evolution lime-cork-clay insulation plaster being applied with spray pump onto solid masonry walls as internal wall insulation

23Spraying Diathonite Evolution lime-cork-clay insulation plaster onto solid wallsSpraying Diathonite Evolution lime-cork-clay insulation plaster onto solid walls

Spraying Diathonite Evolution lime-cork-clay insulation plaster onto solid walls

24Spraying Diathonite Evolution lime-cork-clay insulation plaster onto masonry wallsSpraying Diathonite Evolution lime-cork-clay insulation plaster onto masonry walls

Spraying Diathonite Evolution lime-cork-clay insulation plaster onto masonry walls

25Diathonite Evolution lime cork insulation plaster sprayed in layers to reach required thickness in Muswell Hill, LondonDiathonite Evolution lime cork insulation plaster sprayed in layers to reach required thickness in Muswell Hill, London

Diathonite Evolution lime cork insulation plaster sprayed in layers to reach required thickness in Muswell Hill, London

26Diathonite Evolution lime cork insulation plaster being levelled offDiathonite Evolution lime cork insulation plaster being levelled off

Diathonite Evolution lime cork insulation plaster being levelled off

27Diathonite Evolution lime-cork-clay insulation plaster being levelled offDiathonite Evolution lime-cork-clay insulation plaster being levelled off

Diathonite Evolution lime-cork-clay insulation plaster being levelled off

28Diathonite Evolution lime-cork-clay insulation plaster being levelled offDiathonite Evolution lime-cork-clay insulation plaster being levelled off

Diathonite Evolution lime-cork-clay insulation plaster being levelled off

29Completed internal wall insulation with Diathonite Evolution lime-cork-clay systemCompleted internal wall insulation with Diathonite Evolution lime-cork-clay system

Completed internal wall insulation with Diathonite Evolution lime-cork-clay system

30Completed internal wall insulation with Diathonite Evolution lime-cork-clay systemCompleted internal wall insulation with Diathonite Evolution lime-cork-clay system

Completed internal wall insulation with Diathonite Evolution lime-cork-clay system

Is your house like this one?

If you want a genuinely warm old house rather than a slightly less cold one, the airtightness is not the optional extra. It is most of the result.