Slim frames for stone roofs
The unit that suits these roofs is usually a conservation rooflight. The frame is slender metal with a single bar down the middle, set low so the glass lies flush with the slope. Several of these open, either on a side hinge or as a lift-and-tilt sash, so a bedroom under the eaves can be cooled without altering how the slope looks from the lane. Compared with a standard roof window, a conservation unit carries less frame at the edges and sits closer to the line of the slates, which flatters the old Somerset roofs.
The pairing of a thick stone wall and a steep roof makes for a particular kind of room. The walls stay cold on a spring morning and warm on a summer night, and the air inside settles. A cottage bedroom can be pleasant at dawn and oppressive at eleven at night, which is exactly the hour people lie awake and notice. A conservation rooflight opened an hour before bed lets the top layer of heat go, and the stone walls then do the work of keeping the room moderate.
Houses that grew in stages
Many village houses are really three or four buildings joined together. A seventeenth-century core gains a Georgian wing, a Victorian kitchen goes on at the back, and the roofs meet at different heights and pitches. That is good news for the rooflight, because there is nearly always a quiet corner where a unit can sit out of sight: a valley between two roofs, the slope of an outshut, or a rear wing that nobody sees from the lane.
It also means the loft spaces are not connected. One attic may be reached by a ladder and another by a stair, and a third may be closed off. At survey we look into each one, because the ventilation plan depends on how the air can travel between them. An opening unit in a rear attic will pull more air through a house if its stairs are open, and less if doors have been fitted at the foot.
The Georgian houses and their back slopes
Wrington has some handsome Georgian houses, with symmetrical fronts and tall sash windows. A rooflight on the front pitch would spoil the proportions, and where the house is listed it will not usually be approved. The back slope is a different matter. A roof window, or a pair, on the rear pitch lights the attic and, with a vent bar, lets it breathe. If the roof has a flat section behind a parapet, a small flat rooflight there is often invisible from the road.
Roofs of this age were laid by hand, and rafters rarely run as a drawing would assume. We look from the loft before talking about sizes. Swapping a whole unit counts as notifiable work, and the building regulations guide covers how that notification works. Where a fresh opening needs new trimming, the timbers are framed properly and the roof is dried in before anyone leaves for the night.
