Technical Guidance Note 25: Garage Conversions - Wall Treatments

Type A – Timber frame and damp proof treatment.

 

1. Appropriate damp proofing system applied to walls and floor.
   
   
2. Timber frame set slightly off wall – minimum 75mm x 38mm timbers at 600mm centres built off single course of brickwork.
   
   
3. Insulate timber frame with material of required thermal performance.
   
   
4. Finish with 12.5mm plasterboard.
   
   
5. Insulate floor with material of required thermal performance.
   
   
6. Finish floor with – minimum 65mm of screed, or tongued and grooved timber flooring.

Type B – Blockwork and insulated cavity.

 

1. Brick course laid 75mm from existing wall.
   
   
2. 100mm thermal blockwork laid on damp proof course.
   
   
3. Cavity insulated with appropriate material of required thermal performance.
   
   
4. Finish wall with plaster, or plasterboard.
   
   
5. Damp proof membrane applied to floor.
   
   
6. Insulate floor with material of required thermal performance.
   
   
7. Finish floor with – minimum 65mm of screed, or tongued and grooved timber flooring.

Type C – Timber frame and clear cavity.

 

1. Brick course laid 50mm from existing wall.
   
   
2. Timber frame wall – minimum 75mm x 38mm timbers at 600mm centres built on a damp proof course – lined facing cavity with breather paper.
   
   
3. Insulate timber frame with material of required thermal performance.
   
   
4. Finish with 12.5mm plasterboard.
   
   
5. Damp proof membrane applied to floor.
   
   
6. Insulate floor with material of required thermal performance.
   
   
7. Finish floor with – minimum 65mm of screed, or tongued and grooved timber flooring.

Type D – Composite board and damp proof treatment.

 

1. Appropriate damp proofing system applied to walls and floor.
   
   
2. Insulate floor with material of required thermal performance.
   
   
3. Finish floor with – minimum 65mm of screed, or tongued and grooved timber flooring.
   
   
4. Spot bond composite plasterboard/insulation sheeting to wall.
   (Damp proofing system must be checked for suitability for this use)

Note: these illustrations should not be considered as working drawings.

Building Control Group
Planning Section
Portland House
Richmond Road
Worthing
West Sussex
BN11 lLF

Tel: 01903 221344

E-mail: building.control@worthing.gov.uk

Minicom: 01903 204500

Fax: 01903 207365

Answerphone: 01903 214034

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