Welcome to the Celotex Insulation Blog

Here you will find the latest articles written by our insulation specialists focusing on product developments, building regulations and technical guidance notes.

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Category Archives: Technical


For the building designer, insulation is a year round concern.

Building regulations drive a greater than ever emphasis on sustainable building design – improving the energy efficiency of buildings and reducing carbon dioxide emissions.

However, it is when summer turns to autumn and we begin to reach for our scarves (and thermostats) that the thoughts of many householders turn to insulation.

In the Celotex Technical Centre we field a lot of calls from householders over the colder months, their two primary concerns are upgrading the insulation within their property and condensation.

It is an unfortunate fact of life that energy costs only move in one direction. Upgrading the insulation within your property can reduce your energy costs and improve the comfort of your home.

However, it can be a confusing area for the householder to navigate.

 

Loft insulation upgrades

One of our most frequently asked questions is how to upgrade a ceiling within a property. Despite years of government initiatives to provide subsidised loft insulation, many houses still have little or no insulation in their roof.

While mineral and glass fibre can be cost effective when used as loft insulation, many householders are reluctant to give up storage space.

A rigid insulation board such as Celotex FR5000 can be laid across the ceiling joists and will be strong enough to take occasional traffic. If the boards are overlaid with chipboard, then the loft can still be used for storage. The Christmas decorations need not find a new home!

When upgrading loft insulation it is critical to ensure the loft is sufficiently ventilated. This will minimise any risk of harmful condensation forming in the roof void. It would also be a good idea the check that any water pipes in the loft are lagged.

Upgrading solid and cavity walls

We are often asked about improving the insulation on uninsulated solid masonry and cavity walls.

An uninsulated masonry wall can make a room feel very cold. Where walls face to the north they can become cold enough for condensation to form – leading to damp patches and mold growth.

This form of surface condensation can be resolved by insulating the wall to a better standard. An insulated plasterboard such as Celotex PL4000 is an excellent choice to upgrade a masonry wall with minimal loss of room space.

How to keep warm this winter

Common questions with internal wall lining revolve around condensation, breathability and vapour control layers.

When lining a masonry wall with internal insulation, the masonry behind the insulation can become even colder – as the insulation performs it job and keeps the warmth in the room.

The role of the vapour control layer is to prevent water vapour contained in warm air reaching the cold wall and forming as condensate.

Celotex PL4000 contains an in built vapour control layer that allows masonry walls to be lined without causing a condensation risk.

When considering lining any solid wall, it is important to assess the wall for potential moisture ingress.

Insulation can greatly improve the quality of our life. Whatever your project, speak to the Insulation Specialists.

There was a big song and dance last week as more details of the cake that is Building Regs Part L 2013 emerged from the DCLG oven. So is it time to light the celebratory candles on the Part L cake or should we look at the ingredients first?

Part L is ‘The conservation of fuel and power’. It changes on a regular basis (2006 and 2010) and was a way of taking steps towards a goal of Zero Carbon in 2016. It applies to both those existing buildings already adding to the UK’s carbon emissions and those new buildings that will add even more to the total mix. Read more »

We were promised the long overdue response to the Part L 2013 consultation in ‘the Spring’ by the Government.

OK, given the weather, it is quite difficult to know when the Spring ends and Summer starts, however the rain has got warmer so I think Spring has gone, Summer is here and the response has gone beyond tardy and should be made to sit on the Naughty Step when it eventually appears. Read more »

Thanks to the latest document from DCLG in the shape of the Part L 2013 Impact Assessment the mists of confusion around the policy are starting to clear, a little.

Existing dwellings, for example, have been completely ignored by the policy.

We already knew that consequential improvements and the 120 million tonnes of CO2 savings the policy could have delivered had been ditched. Read more »

IMPORTANT: On 1 September 2017, Celotex took the precautionary measure to temporarily suspend the supply of Celotex FR5000, Celotex CG5000, Celotex CF5000 and Celotex SL5000 while we investigate the results of recent tests (Parts 6 and 7 of British Standard 476). In addition, we have recently identified a compliance issue relating to our calculation and testing of the declared lambda value of products in the 4000 and 5000 ranges and the Crown-Bond and Crown-Fix products within the Crown Flat Roofing range. Due to this issue, the suspension of the 5000 range will continue and now includes the FI5000 and GD5000 products. Materials relating to the 5000 range products are for information only. Please note that all products in the TB4000, GA4000 below 100mm, PL4000 and CW4000 ranges manufactured after 15 December 2017 will be marketed from January as Celotex 3000 with a declared lambda value of 0.023 W/mK.

Please use the link below to read our full statement regarding declared lambda:

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Please use the link below to read our latest statement regarding Class 0:

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At Celotex, we are pleased to announce the launch of two new premium performance PIR plasterboard thermal laminates, Celotex GD5000 and Celotex GS5000.

Celotex GD5000 and Celotex GS5000 comprise premium Celotex PIR insulation adhesively bonded to 9.5mm tapered edge plasterboard and are specifically designed for both new build and refurbishment projects. Read more »

10 Advantages of PIR Insulation

Insulation is arguably the most vital contribution to the comfort and thermal efficiency of your home. Without it you would consume endless amounts of energy to heat and cool your house, and this as we all know, costs a lot of money.  Read more »

Three months on from our previous insight into Building Information Modelling, have the signs that BIM will become part of the specification process a lot earlier come to fruition?  

Well let’s continue with the facts. Driven by the Government’s Construction Strategy 2011, BIM’s gaze is strongly fixed on reducing capital costs and carbon by 20%. This, enhanced by the government’s requirement for BIM to become mandatory on all of its projects by 2016 supports claims that BIM is ‘the future of the construction industry.’ Read more »

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