Hello everyone,
We had a cast-in-place concrete staircase installed in our newly built single-family house. Unfortunately, the builder neglected to measure the staircase right after the formwork was removed.
Yesterday, a staircase specialist visited the site to take measurements and noticed that the step heights vary by up to about 2.5cm (1 inch). This definitely needs to be corrected. He recommended leveling the height differences using OSB boards. Later, a wooden tread will be glued on as the step covering.
Here are my questions for you:
The staircase was poured last August. Does it still have residual moisture? Or should the concrete staircase be treated with a sealing or waterproofing coat? I am concerned that the wooden treads might swell later on.
Also, I am surprised that the stair builder wants to use OSB boards to level the height differences. This would create an additional layer that needs to be glued on. Wouldn’t it be more sensible to even out the step heights with concrete?
Thank you very much in advance.
Best of luck,
julianpe
We had a cast-in-place concrete staircase installed in our newly built single-family house. Unfortunately, the builder neglected to measure the staircase right after the formwork was removed.
Yesterday, a staircase specialist visited the site to take measurements and noticed that the step heights vary by up to about 2.5cm (1 inch). This definitely needs to be corrected. He recommended leveling the height differences using OSB boards. Later, a wooden tread will be glued on as the step covering.
Here are my questions for you:
The staircase was poured last August. Does it still have residual moisture? Or should the concrete staircase be treated with a sealing or waterproofing coat? I am concerned that the wooden treads might swell later on.
Also, I am surprised that the stair builder wants to use OSB boards to level the height differences. This would create an additional layer that needs to be glued on. Wouldn’t it be more sensible to even out the step heights with concrete?
Thank you very much in advance.
Best of luck,
julianpe
Stahlbauer12 Jul 2020 11:05I would add this to the stair builder’s list of defects... There are clear regulations and tolerances... This is also a warranty issue!
Stahlbauer schrieb:
I would add this to the stair builder’s list of defects... there are clear rules and tolerances... it is also a warranty issue!Hello,
Have these limits already been exceeded in the case of the cast-in-place staircase here?
Olli
Stahlbauer13 Jul 2020 08:40wrobel schrieb:
Hello
Has the tolerance already been exceeded for the cast-in-place concrete staircase in this case?
OlliYes, according to DIN 18202, it is 2.5cm (1 inch) too much (I would need to check), as there are clear specifications in this standard. Additionally, the finished staircase must comply with DIN 18065, which states that the rise and going can only vary by ±5mm (±0.2 inches). If the base staircase is already off by 25mm (1 inch), it will be difficult to compensate for this...