6th August 2021

Futureproofing a kitchen extension with H+H Celcon Blocks

Extension of Edwardian home using Celcon Blocks creates more space with added warmth and sound insulation.

Charlotte and her family have always enjoyed living in their Edwardian terraced home in Wimbledon, although after spending lockdown with their two young daughters, they realised they needed more indoor space. The couple decided to complete a rear extension to create more space. Built using H+H Celcon Blocks the extension has made the house noticeably warmer and improved the sound insulation.

Charlotte and her partner already had the planning approved, so they got in contact with Westminster Building Company to check their availability. The Company was able to start on the job quickly, and the whole process from point of contact to completion of the extension took just four months. 

Will Clark, Director of Westminster Building Company, explains why they used H+H aircrete, “H+H is a big name, so I didn’t give it a second thought when using their Celcon Blocks. I knew I was buying good quality building materials that are light to handle and easy to use.”

“Technically speaking this was a job that required some forethought, as the homeowner wanted the extension to be futureproofed for building up a storey. Also, one of the next door neighbours was planning for a rear extension to their home.

“This meant that we built a 300mm wall with two layers of 100mm Blocks with a 100mm cavity wall insulation using 7 newtons thermal Celcon Blocks on the inner skin. This was both to facilitate future upward building and to ensure that the neighbours plans weren’t mitigated.”

Celcon Blocks of 200 mm width or greater can be used for solid wall construction and standard mortar or Thin-Joint methods are both appropriate. It will be necessary to add insulation to the aircrete wall and a durable, permanent external finish such as render, brick slips or other cladding – all of which can be applied with or without external insulation.

As the UK’s largest manufacturer of aircrete, H+H is able to provide technical information for contractors thinking of using aircrete for their next project.

All Celcon Blocks are BBA certified, fire resistant (Up to 4 hours on 100mm walls or up to 2 hours if loadbearing) and have been classified 0 surface spread of flame and non-combustible to Class A1 (the highest class). Celcon Blocks are manufactured in 440mm x 215mm and are available in thicknesses from 75mm to 215mm. 

For more information on H+H products and systems visit www.hhcelcon.co.uk