SIP Construction
With our 1% Better Every Day Topic currently focusing on timber solutions, today we wanted to share a timber product that we are seeing requested more throughout construction projects – SIP, or, Structural Insulated Panels.
What are Structural Insulated Panels?
Structural Insulated Panels are building panels used, most commonly, in residential projects. The panels are made up of a heavy-duty insulated core which is sandwiched between two structural facings. Typically, the facings are made from OSB or Oriented Strand Board – an engineered wood formed by compressing layers of wood strands with adhesives. As a stronger, less expensive alternative to plywood, OSB is generally classed as a sustainable building material as it can be made from sustainably farmed trees with smaller diameters. SIP Panels are fabricated to fit almost any design and are manufactured under factory-controlled conditions.
Image Credit - Nicholas Worley
Why are SIPs so popular?
The market for SIPs is expanding year on year, proving they are looking to become one of the most popular methods of construction. According to Markets and Markets the global SIPs market was valued at USD 405 Million in 2020. With the annual growth continuing to rise rapidly, it is now estimated that the market will hit USD 517 Million by 2025. Approximately 8% of all self-builds use SIPs within their construction. But what makes them so popular?
To begin with SIP construction is extremely efficient. As the panels are constructed off site in factory conditions, they can be both designed and manufactured precisely. This prevents errors when on site, allowing the installation process to progress quickly. With such rapid construction on site the panels for a standard sized house can be installed in as little as two weeks which helps keep other costs down, such as scaffolding and labour.
Image Credit - Nicholas Worley
Due to the nature of their factory-like manufacture, they can be constructed to almost any size and shape. This allows clients and architects the freedom to create expressive, unique designs with relatively few constraints. As the roof panels are structural, roof trusses can be omitted, allowing more head height and versatility.
One of the most important factors of SIPs in the fight against climate change is their energy efficiency. As there are no voids cold bridging is kept to a minimum which ensures Passivhaus levels of insulation and airtightness. SIP houses are approximately 50% more energy efficient than traditional timber frame houses.
Image Credit - Nicholas Worley
Are there any cons to SIP Construction?
Like with all forms of construction, SIP Construction has its pros and cons. To begin with SIP construction is a specialism so you will need to locate a contractor that has knowledge and experience of building with SIPS. Whilst they may be continuously increasing in popularity, it is not guaranteed that your local contractors will be experienced with them.
The main issue with SIPs is their reaction to moisture. SIPs can be easily damaged if exposed to damp conditions and therefore may not be suitable in all circumstances. If a building plot is located within a flood plain SIPs are not recommended at ground level. Likewise, they are not recommended for below ground level construction.
Finally. SIP Panels are generally more expensive than traditional masonry construction. However, due to their ability to cut down on costs elsewhere and the fact that their energy efficiency will reduce energy costs going forward the initial costs involved are worth it.
Throughout our 1% Better Every Day Mission we are exploring better, more sustainable solutions for modern residential and country home construction. As we find new ways to reduce carbon emissions and build solid structures that are better prepared for the effects of extreme climates, we are researching materials and construction methods that meet these requirements. Due to SIPs energy efficient properties, they certainly tick the boxes for an eco-friendlier method of building, and we are pleased to see our clients choose them to ensure their homes reach Passivhaus levels of insulation.
image Credit - Nicholas Worley
The attached photos showcase ‘Corner View House’ the retrofit of a 1960’s ex-authority home in which the clients chose SIP for their extension.