On the Detail Library, this month we’re expanding our collection of masonry wall extension details with a comprehensive new set that explores full fill cavity wall construction in combination with a range of floor types and finishes.
The series includes 14 new details (DL471–DL484), each focusing on typical construction junctions for single-storey extensions using 100mm full fill PIR cavity insulation. These details are designed to support envelope design, with U-value of 0.18 W/m²K.
Both brick and rendered finishes are included, along with beam and block, ground bearing slab, and suspended timber floor options. Roof interfaces cover flat roof, pitched roof, cold roof, and warm roof build-ups — ensuring you can coordinate junctions effectively across the whole envelope.
What’s included:
- Full Fill Cavity Wall with Beam and Block Floor
- Full Fill Cavity Wall with Ground Bearing Slab
- Full Fill Cavity Wall with Suspended Timber Floor
- Full Fill Rendered Cavity Wall with Beam and Block Floor
- Full Fill Rendered Cavity Wall with Ground Bearing Slab
- Full Fill Rendered Cavity Wall with Suspended Timber Floor
- Full Fill Cavity Wall to Eaves – Cold Roof
- Full Fill Cavity Wall to Eaves – Insulation Between and Under Rafters
- Full Fill Cavity Wall to Cold Flat Roof Eaves
- Full Fill Cavity Wall to Cold Flat Roof with Existing Pitched Roof Abutment
- Full Fill Cavity Wall to Cold Flat Roof – Existing Wall Abutment
- Full Fill Cavity Wall to Flat Roof Parapet Detail
- Full Fill Cavity Wall Window Head and Cill Detail
- Full Fill Cavity Wall Window Jamb Detail
Why full fill?
These details are ideal for straightforward construction in low-rise domestic extensions. Using full fill insulation in the cavity allows for a reduced wall thickness compared to partial fill systems, making it particularly useful where space is limited.
Explore the full set below.
Latest Article
Ever wondered how to spot hidden draughts or missing insulation without opening up walls? Thermographic imaging uses infrared technology to reveal where buildings lose heat — turning invisible problems into visible solutions.
Our latest technical guide explores how IR cameras work, what they can uncover, and how they help create warmer, more efficient homes.
If you are interested in joining our community, head over to the Detail Library to learn more about our platform and get yourself signed up.
0 Comments