Self-build insulation
Looking for flexible self-build insulation? Fleming Homes provides bespoke high-performance external wall insulation with 4 U-value options, offering exactly the right specification for every self-build project.
External Wall Insulation
Whether you’re looking for pre-insulated self-build panels from our flexible U-value range, or an entirely bespoke solution for specific insulation needs, we can deliver! Because we build our timber frame panels and pre-insulated panels in-house, we can give self-builders the full spectrum of options.
As a starting point for your project, see below for our four external wall insulation specifications, ranging in U-value from 0.19-0.11W/m²K. All our quotations include a clear cost breakdown for each insulation option, so you can see what each choice means for your project budget. If you’re looking for bespoke insulation for your self-build, we can also make pre-insulated panels based on your architect’s specification. If you have a particular U-value or specification in mind, we can build exactly what you need.
Check out our four standard insulation products below, or get in touch to discuss your specific requirements.
Whole House Insulation
Ensuring a high level of insulation in your self-build’s walls, roof and floors will enable you to keep the heat in and your energy bills low.
To see how homes are typically insulated, download our illustration by clicking on the button below.
Premier Plus
(0.19W/m²K)
Premier Plus wall insulation has a U-value of 0.19W/m²K. Premier Plus uses a denser glass fibre insulation product along with an internal thermal reflective air-tight barrier and a service void, for increased U-value performance. Premier Plus achieves an excellent balance between total build costs and future running costs. It’s the ideal choice for self-builders looking for a cost-effective option that combines low installation costs with substantial future savings.
- Top & Bottom Plate — 140x38mm treated
- Studs — 140x38mm treated @ 600mm crs.
- Lintels — 2/220x45mm C24 treated (or as required by design)
- Sheathing — 9mm OSB 3 (factory fitted)
- Breather Membrane — Glidevale Protect (silver reflective) TF200 Thermo (factory fitted)
- Headplate — 140x38mm treated
- Packer Headplate — 140x14mm treated (as required by design)
- Insulation — 140mm Frametherm 35 glass fibre
- Vapour/Air Tightness Barrier — Protect VC reflective foil
- Internal Cavity Battens — 38x25mm treated @ 600mm crs.
- Plasterboard — 12.7mm T/E plain plasterboard
Premier FIT
(0.17W/m²K)
Premier FIT is a simple yet effective wall insulation that is perfectly suited to self-builders looking for a quality pre-insulated structural timber frame option. Many self-builders prefer the flexibility of sourcing a ‘structure only’ kit package, leaving them to follow on with other products to complete the final wall (and dwelling) specification.
If you carry out the work yourself, this can be highly cost effective. It also gives you more options for follow-on products.
Premier FIT is ideal for DIY self-builders who recognise that fitting rigid insulation onsite is tricky and time-consuming. With Premier FIT, you can trust that the crucial structure and primary insulation are taken care of, leaving you to concentrate on installing the rest. The U-value of Premier FIT wall insulation depends on the final specification of the wall. Examples of these details and U-values are described in our Premier Plus FIT and Superior FIT specifications.
- Top & Bottom Plate — 140x38mm treated
- Studs — 140x38mm treated @ 600mm crs.
- Lintels — 2/220x45mm C24 treated (or as required by design)
- Sheathing — 9mm OSB 3 (factory fitted)
- Breather Membrane — Glidevale Protect (silver reflective) TF200 Thermo (factory fitted)
- Headplate — 140x38mm treated
- Packer Headplate — 140x14mm treated (as required by design)
- Insulation — 120mm TW55 rigid (factory fitted)
(The typical u-value of this detail using VC foil air tight barrier & 25mm (Mn) service cavity battens, plasterboard & an external masonry skin is 0.17 W/m²K)
Premier Plus FIT
(0.16W/m²K)
Premier Plus FIT has long been our most popular wall insulation. Why? Because it was specifically designed for an outstandingly efficient balance between product and installation costs, and expected payback periods relative to performance.
With Premier Plus FIT, the primary rigid insulation layer is factory-fitted, with site-fixed VC reflective foil vapour/air-tight barrier fitted on top. It has a 33mm service void – deep enough to avoid the need to puncture the airtight barrier. With standard 12.5mm plasterboard fitted over, the U-value is an excellent 0.16W/m²K.
- Top & Bottom Plate — 140x38mm treated
- Studs — 140x38mm treated @ 600mm crs.
- Lintels — 2/220x45mm C24 treated (or as required by design)
- Sheathing — 9mm OSB 3 (factory fitted)
- Breather Membrane — Glidevale Protect (silver reflective) TF200 Thermo (factory fitted)
- Headplate — 140x38mm treated
- Packer Headplate — 140x14mm treated (as required by design)
- Insulation — 120mm TW55 rigid (factory fitted)
- Vapour/Air Tightness Barrier — Protect VC reflective foil
- Internal Cavity Battens — 50x33mm treated @ 600mm crs.
- Plasterboard — 12.7mm T/E plain plasterboard
Superior FIT
(0.11W/m²K)
For a lifetime of much lower energy bills, look no further than Superior FIT, designed for ‘fabric first’ self-build thinking. Superior FIT uses combined insulating layers to achieve its exceptional performance. The core layer is factory-fitted 120mm rigid insulation, complemented by a 20mm air gap to the extremity of the structural stud. A site-fixed layer of 50mm rigid insulation addresses cold bridging, and is sheathed with a VC reflective foil acting as an air-tight barrier. Generous battens (33mm) create a cavity sufficient for service runs. Finished with 12.5mm standard plasterboard, the U-value is exceptional at 0.11W/m²K.
- Top & Bottom Plate — 140x38mm treated
- Studs — 140x38mm treated @ 600mm crs.
- Lintels — 2/220x45mm C24 treated (or as required by design)
- Sheathing — 9.5mm OSB (factory fitted)
- Breather Membrane — Glidevale Protect (silver reflective) TF200 (factory fitted)
- Headplate — 140x38mm treated
- Packer Headplate — 140x14mm treated (as required by design)
- Insulation (layer 1) — 120mm TW55 rigid (factory fitted)
- Insulation (layer 2) — 50mm TW55 rigid
- Vapour/Air Tightness Barrier — Protect VC reflective foil
- Internal Cavity Battens — 50x33mm treated @ 600mm crs.
- Plasterboard — 12.7mm T/E plain plasterboard