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Warm roof conversion

Warm roof conversion

You may ask, why do I need a warm roof conversion on my conservatory? Polycarbonate conservatory roofs and even glazed ones are prone to heat loss. We have all been in a conservatory in winter that is bitter cold and frankly unpleasant to sit in, and the opposite in summer. A scorching room requiring the door and windows to be opened constantly to keep the heat at bay.

There have been solutions along the way, polycarbonate inserts designed to reflect the heat either upwards in summer or down back into the room in winter. These inserts are fiddly, and some even block the light coming through the roof, negating the point of having the polycarbonate roof in the first place.

U Values

U values is a measure of how slowly a material passes its heat. The slower it passes its heat from one side to the other, the better the insulator it is. A lower U value is classified as a better insulator.

As a reference a brick cavity wall achieves a rating of around 1.6W/m²,  A typical high performance polycarbonate sheet will have a U value of around 1.2 W/m², this is a hugely important figure as of course heat rises and most of a buildings heat escapes through the roof and windows.

Some of the high performance glass we can supply can only reach a U value of 1.0 W/m², which is an improvement, but cannot match the warm roof conversion value of 0.18 W/m².

The difference between a warm roof conversion and polycarbonate or glazed roof will be quite noticeable and will make the room an all year round usable space. Provided of course the windows and doors fitted in your conservatory are up to date, of good quality and properly installed.

We currently supply two different warm roof conversions, a Sentinal Solid Roof, and a WARMroof. We have a display available of each roof at certain branches.

Running Costs

Older ploycarb and glass roofs are such a terrible insulator that the heat required to keep the roof at a comfortable level is extremely high. Many will leave the conservatory ‘closed off” from the house and will turn any heating off in this room untill the weather improves. This is fine, but such a waste of a room. As we mentioned above the U value is so impressive on the warm roof conversions we can supply that this will longer be the case. Your heating bill will shrink and your house’s living space will grow.

Value for money?

Depending on what size and shape conservatory you have that you would like re-roofing, the prices can vary from £1500 to £10,000’s. If you are starting from the ground up and don’t have an existing conservatory, installing a new conservatory can lift the value of your house by a staggering 15%, thats £45000 on a £300k house! Its widely believed that a Warm roof will further increase the value of any such home improvement also.

Sentinel Roof

Of our two systems that we supply, the Sentinal Solid Roof is a timber based design. More info on the aluminium and steel WARMroof system can be found here

Sentinel warm roof conversion after

We have the above Sentinel roof installed in our Bristol showgarden. A quick and easy roof to install with a fantastic low U value (0.18) for warmer winters and more comfortable summers.

Its a warm roof conversion system based around pre-assembled timber pods. Using timber is a great way to cut down on condensation compared to other metal and composite alternatives.

Installation is straightforward and a waterproof roof is often achieved within a few hours of starting with minimal disruption.

Once the timber pods are installed the insulation can be installed. This is what really helps to lower the U value so much.

These roofs are supplied with high performance multi foil insulation. This has the ability to insulate the roof very well, whilst keeping the profile of the roof down, if you were to use solid foam insulation you would need to use over 75mm to reach a similar insulation value, this would mean a thicker rafter height, more weight and a lower ceiling height inside.

Sentinel warm roof conversion before plasterboard

We realise that a roof replacement will effect the light transmission into the room, so you can opt for roof lights to be designed into the roof, depending on the style and sze. These will be supplied complete with flashing kits ready to drop straight into the precut holes.

Sentinel warm roof conversion before plasterboard 2

The inside is now ready to be wired up if you are having any lighting/speakers in the roof. The rafters are battened out and after that the plasterboard is cut and fitted, then plastered.

sentinel warm roof conversion (3) sentinel warm roof conversion (4)

To finish, lightweight tiles are supplied in a style and colour of your choosing. You have a choice of slate effect PVC tiles that are a fantastic alternative to real slate, or a lightweight steel tile which has an extremely hard wearing surface.

envirotile anthracite grey

We offer Tapco slate or Envirotiles. Both of which can be purchase separately to a warm roof for any other projects they may be suitable for. We’ve fitted Envirotiles to a garden shed here.

tapco-panel metrotile-panel


Watch the transformation in this short video. This was completed in testing weather conditions over 1.5 days. The speed of which this went up to a watertight point meant that disruption to the room/house was at a minimum and the rain didn’t affect things too badly.



If you need more information on a Warm Roof Conversion or would like a quote on one please fill out the below form. You can download a Sentinal brochure here also.