Ecospheric's Top Tips

We only supply windows to an approved list of architects and installers who are experienced in detailing and installing high performance timber windows and doors. Please get in touch to get connected with one of our approved professional partners.

We don't supply fewer than 5 windows (eg. a bay window would be considered 1 window). We also focus on projects aiming for Passivhaus or low energy whole building retrofit.

We mainly supply to projects located in the Northwest of England (Greater Manchester, Cheshire, Merseyside). We will only supply to projects outside of this region if it is for one of our existing professional clients.

Thermal performance PVC is more conductive than timber and also requires a hollow drip within the frame structure which allows air to circulate inside the frame further increasing heat loss. With regards to aluminium it’s a whopping 2000x more conductive than timber! Hence why you often struggle to get a whole window thermal value (Uw) from an aluminium manufacturer and they concentrate instead on advertising the glass thermal value (Ug). There are thermally broken aluminium composites on the market, but they come with a considerable price tag. To save cost and retain performance most people seeking aluminium style windows go for aluclad timber instead. Longevity Down the line when the units no longer perform as desired (generally due to misalignment or inadequate performance) PVC units can only be ripped out and disposed of whereas timber units can be realigned and upgraded. With new manufacturing techniques and highly durable polyurethane paints, timber units also require far less maintenance than ever before. Whilst aluminium offers the least misalignment possibility, there is no upgrade possibility on a unit which is often inherently poor performing to start. Embodied carbon PVC windows units have 10 times as much carbon embedded than timber units and limited recyclability. Non-recycled aluminium utilises a highly energy-intensive process to convert the raw mined bauxite but is fully recyclable providing it is not formed into a thermally broken composite. Aesthetics A matter of preference, but most potential home purchasers further down the line will place a higher value on timber or aluminium over PVC windows. With architects clambering for slimmer and slimmer frames, aluminium has a very desirable aesthetic in modern design. A similar effect can be created by embedding timber frames in the plaster/render/cladding however, with reduced cost and higher performance. Cost A quality uPVC unit with comparable Uw values is not dissimilar in cost to a timber unit. There are however a lot of poor quality and low performing units out there at a considerably lower cost. Aluminium is the most expensive option, especially for the thermally broken specification. Aluclad adds around 30% to a timber model without sacrifice to performance.

1. Ensure you are comparing like for like estimates Use the schedule from the first company to send out to the others to ensure that they are pricing exactly the same specification. A lot of companies keep their pricing document separate to the main schedule to make it nice and easy. 2. Compare whole window Uw value (not Ug value) Ug only tells us about heat loss through the glazing and does not allow for the framing technology which is responsible for the vast majority of the heat loss. Remember the lower the Uw the better. Passive house units generally have a Uw of 0.6-0.8, standard triple glazing 0.8 -1.0 and double glazing 1.2-1.6. In comparison, old single glazed windows have a Uw of around 3 and sliding sashes 4.3. 3. Air tightness Most companies undertake the testing, but few publish results on their website so you will likely have to request it. It's an important metric as it indicates the convective losses (i.e physical movement of air through gaps). 4. Lead Times These vary widely, generally between 4 and 12 weeks. This may be of importance if you have to wait for an aperture to be created before measures can be submitted. 5. Warranty Check the small print not just the highly advertised number of years! (i.e. 10 years of virtually non existent cover is of little value.) 6. Technical support As well as providing technical product and installation information, a company should help you put together a schedule that optimises cost, aesthetic and performance and highlights where improvements can be made (reduction of openers, etc).

The majority of a window's heat loss is through the frame, therefore aiming for as close to a single fixed pane as possible is ideal. Cost also increases with complexity. Option 1: Single fixed pane of glass ~£220, Uw=1.2 Option 2: 2 panes of glass (double the cost of option 1) ~£400, Uw=1.3 Option 3: 6 panes of glass (triple the cost of option 1) ~£600, Uw=1.4

Window estimates often look complicated and it can be hard to ascertain if they include everything you want and be sure that costs won't spiral at the last minute. The following all generally have a cost associated so make sure they have been allowed for if required: Delivery to site Cills Toughened or obscured glass Openers (this makes a huge difference to cost!) Non standard finish, dual finish, or aluclad Child restrictors Trickle vents (we recommend taking a controlled ventilation strategy utilising systems like MVHR - contact us to find out more) Installation

We recommend allowing at least 6 months to one year from the point when you obtain your initial price estimate until installation. This will allow time for comparing estimates from different suppliers, refining the specification, securing a suitable installer, and considering all the aesthetic and technical options. Specifying the correct windows can be a surprisingly complicated process. Our tips for speeding up the window specification process include: - Hire an architect/installer to create a window schedule which includes the required dimensions, opening types, and specification (u-values, emergency egress windows, safety glass, etc). - Involve your installer in the specification process including conducting a detailed measurement survey, checking over the specification to ensure the units are suitable, aware of the installation requirements for the units, developing a strategy for site access and considering whether specialist delivery or lifting equipment will be required - Checking with building control to ensure that the new or replacement windows and doors will meet the necessary building regulations requirements

We can provide you with a list of recommended installers and contractors who have experience installing Viking Windows in the Northwest. Please go to our Installations page to find out more.

Aside from following manufacturers guidelines, we recommend using the Tremco Illbruck i3 installation system. Suitable for a wide range of window and doors (not just those supplied by Ecospheric) it enables a fantastic airtight seal to complement your high performance glazing. For more information, check out https://www.illbruck.com/en_GB/products/innovations/i3-system/ (Image source: https://www.youtube.com/watch?v=Fiyz-NHF-Oo&t=2s)