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On the right footing… foundation types for garden rooms
Have you been wondering about which type of foundation system might be right for you and your garden room? If so, you’re not alone; we’re asked on a daily basis about the wide array of options discussed with groundworks experts and we have several of the preferred types to highlight for you as a reference:
Solid Concrete Slab This is the preferred option for most Garden Room Suppliers and Groundworks Professionals alike, it’s quick to prepare, it’s the most solid foundation system available and is wonderful for the Garden room installers but the one downside is that this system is not very environmentally friendly. Concrete slab foundation systems are normally formed to the same external diameter of the garden room and a minimum of 100mm thick. A client of ours has just had her slab installed in advance of her Rotunda arriving and an example of it is shown below:
Average cost for a 4.5m diameter Garden Room £1,500 – £1,950 —————————————————————————————————————————————————–
Swift Plinth and Eco-Base Foundation System
This is a neat little system which supports the Rotunda on a dozen or so ‘feet’ which are small recycled concrete ‘pyramids’ sitting on top of plastic eco-grids which are 1m x 1m in size (which are set about 10cm down in the soil and packed with hardcore or gravel) at load-bearing intervals around the perimeter to support a timber sub-frame.
I think of this eco-grid system as the equivalent to the Eskimo tennis racket shoe used to avoid sinking down into snow! This means, less concrete, less digging, less time and more flexibility (ie: each footing has an adjustable bracket). The company which provides these also create the plastic grid system which you may have seen used as temporary car-parks in fields and rural areas. The footings themselves are a little expensive though and this system does require a timber sub-frame which would elevate your building up by another 20cm or so. This isn’t the cheapest option, but is probably the most time and energy efficient.
(Average cost for a 4.5m diameter Garden Room £1000 – £2500) —————————————————————————————————————————————————–
- Foundation Block Foundation System The most commonly used system we’ve encountered to date and it comes in at a lower cost than the above options but is more labour intensive and involves a lot of digging. Essentially, holes are dug-out to a depth of between 80cm and 1 metre at regular intervals (spaced out every 40cm to support floor joists) and then foundation blocks built up with cement and hardcore to provide solid ‘pillars’ which support the building. The blocks must protrude at least 10cm from the surface area of the ground to provide air-flow underneath the building.
(Average cost for a 4.5m diameter Garden Room £800 – £1400)
All of the foundation systems mentioned above should also utilise full membrane systems both above and below the footings, to protect the timber elements of the building resting on it and to prevent growth of vegetation coming up from below.
Of course, each and every foundation system available is hugely dependent on the site location, the soil type and gradient of the land. It’d be best to check with a local groundworks contractor before deciding on installing any type of building on you property and obtaining several quotes to ensure you get the best deal. If you’re ever in doubt, feel free to call us at Rotunda (0161) 222 3350 and one of our joiners will be able to assist over the phone or pop over and give you some advice as part of our non-obligation site-survey service!
Have a great weekend everyone!
Living in Yurts – the very first Prefabricated Houses
Living in Yurts – the very first Prefabricated Houses
Recently I’ve been chatting with friends who live in a ‘yurt’ about my desire to make the transition myself and naturally I find myself drawing comparisons to our lovely Rotundas – weighing up the pros and cons of a simply canvas cylinder or a timber framed circular dwelling.
Our British climate mightn’t be particularly well suited to perpetual canvas living but a few hardy folk do indeed live in yurts through all seasons and are seemingly very happy. Since my very first introduction to circular buildings several years ago (and my ongoing passion for living, working and relaxing in the round) I’ve been fascinated by the history and the flexibility of the yurt. For those of you who aren’t overly familiar with the yurt, it’s a Mongolian structure (Genghis Khan and his horde used them) built primarily from latticed wood (to produce the cylindrical wall system) held together by a wooden band with a roof which is formed by long poles which extend from the top of the walls to arrive at a central point called the “crown” (which is a small circular opening, traditionally was used as a smoke hole) which provides both natural daylight and a beautiful focal point. The Yurt was born into existence by nomadic tribes who needed a house that could be easily constructed and moved, built with materials they had on hand (wool and wood) which was lightweight enough to be carried by a couple of horses and would be comfortable enough to withstand the winters but provide a cool retreat in the summer.
Estimated to have been created about 2,500 years ago, this central Asian design is still being used today as living spaces and quirky holiday retreats for the people all over the UK and I can see why.
An Eco-friendly round living space has enormous appeal for many of us and maximises the greatest use of floor area, is a natural and unobtrusive structure with minimal impact to the surrounding landscape and ground it’s sited on, they’re quick to erect and dismantle and they are warm and cosy when the fire is lit. The downsides, as far as I can see are that the yurt itself, being a central Asian design, isn’t particularly in-keeping with the British Countryside; there are very few (if any) windows and those that do are invariably old UPVC units from a brick-built domestic house, there are no electrics (so, no hair-dryer ladies I’m afraid) nor is there insulation and they need quite a bit of maintenance such as re-waterproofing the canvas and tightening the ropes. In fact, most UK holiday sites are required to take their Yurts down during the winter period which only really brings them revenue during the summer months.
Although I have a strong attraction to the traditional yurt I do firmly believe that after 2,500 years the yurt is due for a significant upgrade. Whilst in the process of looking for some land so my family and I can live off-grid and in greater harmony with nature, I’ve come to the conclusion that the Rotunda is in fact the modern (and upgraded) equivalent to the Mongolian Yurt, and it’s not a moment too soon. Our current civilisation (although many of us keen for a more sustainable living arrangement) has a requirement for a supply of electricity for modern day appliances and would expect to have a structure which mightn’t need to be removed and reassembled numerous times as the Mongol travellers did. Our climate can be bitterly cold in the winter months and thus, it would be advantageous to have a fully insulated building which would retain the heat and not lose it all though a single layer of canvas. Most notably, the Rotunda is a timber-clad building making the most of the British Larch which we source locally. A design which is more in-keeping with the British countryside but is also reminiscent of Swedish log cabins, traditional barns and lodges which provide more stability, durability and the option of modern day appliances and in-house entertainment (which could of course be powered by alternative energy sources)
So, thank you Yurt for the beauty and joy which you’ve provided for 2,500 years but personally I’d place my bets on the new equivalent which is much more suited to our climate, addresses our need to conserve energy and provides a more long-term living arrangement.
Yurt, my friend, you have evolved.
Blogpost written by Gemma Roe.
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