Urgent advice on roof lights positioning please

3 years ago

Could you please help me to choose the right size and its position of the flat roof lights ( ground floor extension 4.5 x 4.2 m). I have 1 day left to decide as the roof is being done. Many thanks in advance. Floor plan is attached.

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Comments (4)

Daisy England
3 years ago
How many are you having? What’s going on the left hand side of the plan?
san27b
Original Author
3 years ago
Just the sitting area (tv, sofas, coffee table)
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Duncan Green
3 years ago
last modified: 3 years ago
Done several of these over the years. Typically clients go with a large rectangular lantern light with openable lights for ventilation. I've also done flat rooflights (not opening). Rooflights get hot in the summer and cold in the winter. They will also fog up with condensation if no way of ventilating. So get opening rooflights. Try two Velux CVP flat roof windows with winding gear so they can open or if you have bigger budget try the equivalent from Glazing Vision or perhaps a lantern with opening lights. Glazing vision is a nicer product, never had any complaints and helpful to work with. Based on what I can interpret from the plan you could have large roof opening 6x3m (based on plan dims) (You mention 4.5x4.2m?. either way leave about 1m 0.9m from the edge to the rooflight). May need to install steel beams or double/triple trimmers bolted together (based on weight of rooflight, roof and span of opening) If you are in a specialist planning area Conservation or Dark Sky policy, then you will need to check with planners to do either! and may have to apply for a minor material amendment. Your builder/engineer will know what these are and the calcs for them. Alternatively try 2 or 3 smaller square of rectangular shaped rooflights with trimmed openings. Make sure your builder understands how to do a timber insulated builders kerb to comply with Building Regs and properly lapped and weather sealed at junctions. You will need to check with the Building control officer if you need a SAP calculation, for the extra window openings. This may require you to have some improvements elsewhere within the build. Based on your doors you probably already have had to get involved with one. Also check for fire resisting requirements and resist impact from falling for maintenance. The BCO will know and so will the rooflight manufactures. Should be a very nice light and airy space. Regarding your sliding doors go for bi-fold sliding ( bottom bearing not top hung) if you can along with one leaf being useable as a normal door (fire exit and general use), and go for the level access threshold. Lower the door frame into the wall so it is level with the floor and raise the external surface (decking or hard surface) up to the threshold with a nice channel drain between or narrow slot drain (Gatic or ACO). External surface needs to fall away from the building shallow fall if possible. Will look very pimp. Clients always like this look and more friendly/traversable with kids and elderly. Make sure the doors have a proper weather sealed threshold some do not, and your insurance wont cover this for leak from wind driven rain. What are you doing with the garden? assuming you have one. You may want floor uplighters in Indian sandstone paviours, with a hottub on or sunken timber deck or a meandering path to a sun terrace or pergola, always popular features with clients. Duncan Green.
minipie
3 years ago
May be too late but we have this:

The rigt hand one opens, the left hand one is fixed. The left hand one is important for giving light to the area behind the extension.

Urgent advice on roof lights positioning please

Comments (4)

Daisy England

san27b
Original Author

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Duncan Green

minipie

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Urgent advice on roof lights positioning please

Comments (4)

Daisy England

san27bOriginal Author

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Duncan Green

minipie

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san27b
Original Author