If you’re planning a new build or a major extension, the question of how to keep the finished space warm, and affordable to run is usually an important consideration. Structurally insulated panels, (SIPs), have become one of the most talked about options for anyone looking to build an energy efficient home.
What Are Structurally Insulated Panels?
A SIP is a factory-made panel consisting of a rigid insulating foam core sandwiched between two layers of structural board, typically oriented strand board. Rather than building a wall in stages, with separate framing, insulation and boarding, a SIP arrives as one complete unit. It forms the wall, floor or roof structure and its own thermal barrier in a single piece.
This method of construction has been used across Europe and North America for decades and has grown steadily in popularity in the South West as homeowners and architects look for ways to meet tighter building regulations and reduce ongoing energy costs.
Why SIPs Perform Well Thermally
The main reason SIP homes are considered energy efficient is due to how they’re constructed Traditional timber frame or masonry construction relies on insulation being fitted between studs or cavities, which leaves gaps, joints and thermal bridges where heat can escape. A SIP panel, by contrast, is a continuous layer of insulation with very few interruptions.
This continuous build has two main benefits. First, it reduces the thermal bridging that causes cold spots and heat loss in conventional builds. Second, the panels create an airtight structure almost by default since the joints between panels are sealed during construction. Airtightness matters just as much as insulation value when it comes to keeping a home warm, as uncontrolled draughts can undo much of the good work done by high-performance insulation.
Independent testing has consistently shown SIP structures achieving U values considerably lower than those required by current building regulations, meaning less heat escapes through the walls and roof.
Practical Benefits Beyond Heating Bills
Lower energy use isn’t the only advantage. Because SIP homes are so airtight and well insulated, they tend to hold a steady, comfortable temperature throughout the year, staying cooler in summer as well as warmer in winter. Many homeowners also find that smaller heating systems are sufficient to heat the whole property, which can bring down installation costs alongside running costs.
There’s a construction schedule benefit too. Because panels arrive pre-manufactured to precise specifications, build times on site are often shorter than with traditional methods, which can reduce labour costs and get you into your new space sooner.
Are SIPs Right For Your Project?
Every project is different, and the right build method depends on the site, the design and your budget. SIPs suit new builds, extensions and garden studios particularly well, where the benefits of a highly insulated, airtight shell can be designed in from the outset. For renovations of older or listed properties, other approaches may be more appropriate, and a good local builder will talk you through the options rather than pushing one solution for every job.
Talk To Marptree
At Marptree, we’ve worked on high end new builds, extensions and renovations across Bath and the surrounding area, and we’re happy to discuss whether a structurally insulated panel build is the right fit for your project. Get in touch on 01225 805 055 or email info@marptree.com to talk through your plans with our team.