Hello everyone,
We have a bathroom on the upper floor with an area of about 8 m² (86 sq ft). Originally, we planned (in coordination with both the planner and the carpenter) to install two roof windows measuring 78 x 114 cm (31 x 45 inches) (W x H).
However, the roofer now says that due to the battening, neither the 114 cm nor the 98 cm height will work, and only windows sized 55 x 78 cm (22 x 31 inches) are possible (don’t ask me what went wrong here – I assume the detailed planning could have been more thorough). Well, that’s how it is now.
We are concerned that it might be too dark. Apparently, wider windows—something like 140 x 78 cm (55 x 31 inches)—are not available. As an alternative, a daylight spot was recommended to us, but we’re not very convinced by this, as it would require some ductwork on the attic floor and would probably increase the cost.
I find it hard to imagine the size – will two smaller windows (55 x 78 cm) be sufficient to provide comfortable natural light in the bathroom with a 45° roof pitch?
Do you know of any other solutions—for example, manufacturers that offer windows in different formats? The roofer is apparently using brands like Lux or Oto.
Thanks for your input.
Best regards
We have a bathroom on the upper floor with an area of about 8 m² (86 sq ft). Originally, we planned (in coordination with both the planner and the carpenter) to install two roof windows measuring 78 x 114 cm (31 x 45 inches) (W x H).
However, the roofer now says that due to the battening, neither the 114 cm nor the 98 cm height will work, and only windows sized 55 x 78 cm (22 x 31 inches) are possible (don’t ask me what went wrong here – I assume the detailed planning could have been more thorough). Well, that’s how it is now.
We are concerned that it might be too dark. Apparently, wider windows—something like 140 x 78 cm (55 x 31 inches)—are not available. As an alternative, a daylight spot was recommended to us, but we’re not very convinced by this, as it would require some ductwork on the attic floor and would probably increase the cost.
I find it hard to imagine the size – will two smaller windows (55 x 78 cm) be sufficient to provide comfortable natural light in the bathroom with a 45° roof pitch?
Do you know of any other solutions—for example, manufacturers that offer windows in different formats? The roofer is apparently using brands like Lux or Oto.
Thanks for your input.
Best regards
Hello to both of you. The orientation is north.
The knee wall is approximately 1.60 m (5 ft 3 in) high, which is quite tall, so the possible height is limited – the room is not located next to a gable wall.
So, better 1.34 x 0.78 m (4 ft 5 in x 2 ft 7 in) instead of 2 small ones?
Best regards and thanks for the input.
The knee wall is approximately 1.60 m (5 ft 3 in) high, which is quite tall, so the possible height is limited – the room is not located next to a gable wall.
So, better 1.34 x 0.78 m (4 ft 5 in x 2 ft 7 in) instead of 2 small ones?
Best regards and thanks for the input.
B
baumann20139 Aug 2015 10:11Then I would talk to the roofer about the largest possible glazing area that can still be installed now.
The visible glass area of the 1340 x 780 mm (53 x 31 inches) window sash is 1128 x 568 mm (44 x 22 inches), resulting in a glass surface of 0.641 m² (6.9 sq ft).
The visible glass area of a 540 x 780 mm (21 x 31 inches) window sash is 328 x 568 mm (13 x 22 inches), resulting in a glass surface of 2 × 0.186 = 0.373 m² (4.0 sq ft).
Even two 740 x 780 mm (29 x 31 inches) windows (which probably won’t fit) would have only 0.6 m² (6.5 sq ft) of glass surface.
In other words, the 1340 x 780 mm (53 x 31 inches) window should be the best choice to maximize daylight.
The visible glass area of a 540 x 780 mm (21 x 31 inches) window sash is 328 x 568 mm (13 x 22 inches), resulting in a glass surface of 2 × 0.186 = 0.373 m² (4.0 sq ft).
Even two 740 x 780 mm (29 x 31 inches) windows (which probably won’t fit) would have only 0.6 m² (6.5 sq ft) of glass surface.
In other words, the 1340 x 780 mm (53 x 31 inches) window should be the best choice to maximize daylight.
B
baumann20139 Aug 2015 13:51Do you have a dimensioned floor plan of the room? I wouldn’t say that in such general terms.
No degrees included. I will gladly post it this evening.
The room is in a sandwich configuration and measures 2.46 meters (8 feet 1 inch) wide and 3.28 meters (10 feet 9 inches) deep. The knee wall is on the width side (2.46 m) and is 1.6 meters (5 feet 3 inches) high from the finished floor level. The roof pitch is 45°. The layout of the fixtures is as follows:
Starting from the knee wall on one long side, first the toilet, then the washbasin. On the opposite side, the bathtub and then the shower. In the middle, there is an aisle approximately 90 centimeters (35 inches) wide.
The window or windows will be placed on the width side.
The room is in a sandwich configuration and measures 2.46 meters (8 feet 1 inch) wide and 3.28 meters (10 feet 9 inches) deep. The knee wall is on the width side (2.46 m) and is 1.6 meters (5 feet 3 inches) high from the finished floor level. The roof pitch is 45°. The layout of the fixtures is as follows:
Starting from the knee wall on one long side, first the toilet, then the washbasin. On the opposite side, the bathtub and then the shower. In the middle, there is an aisle approximately 90 centimeters (35 inches) wide.
The window or windows will be placed on the width side.
B
baumann20139 Aug 2015 17:12For the eaves side length, I would go with the larger window. I wouldn’t like having two windows side by side at such a short distance.
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