Hull City Council, Hull

Providing the solution for EWI retrofit on non-traditional build housing

Having successfully completing the previous 2 phases, K Systems were approached to provide a specification for EWI installation onto two non-traditional build housing types: 5M and Caspon. Both archetypes are of timber frame construction with single skin brick infills at ground level and a mixture of hanging tiles or cladding on upper floors. Typical of non-traditional build housing, the technical team at K Systems had to pay particular attention to bespoke detailing to derive a suitable EWI solution to meet the client’s requirements.

The hanging tiles and cladding were removed from the upper floor(s) and replaced with timber sheathing boards to allow for a uniform aesthetic and a striking contemporary finish.

Delivering a robust, safe and aesthetic system solution to meet the project requirements

Hull City Council wanted to improve the thermal efficiency of their housing stock whilst provide a durable and more contemporary aesthetic look for the project.

A combination of K Systems M Silicone and K Systems M VBriQ was used to achieve a u-value of 0.28 using varying thicknesses of A1 non-combustible mineral wool (80mm to 150mm) to adapt to the variety of substrates typical of non-traditional build housing. The combination of acrylic brick slips and polymer enhanced silicone topcoats achieved an appearance that is durable and elevated the dated look of the estate to a more modern feel. Our team worked extensively with the appointed architect preparing bespoke detailed drawings for the various archetypes, particularly transitions between the brick and timber substrates, cills, verges, rooflines, gas boxes and below DPC.

Weekly demand planning meetings ensured timely delivery of materials to the appointed contractor.

We ensured the correct fixings were specified

K Systems commissioned pull-out tests to determine the optimum fixings and washers to be used to anchor the EWI system to the different substrates. A combination of hammer fixings and screw fixings were specified.