I have built molds for a small patio and staircase, and sometimes frugality deceives wisdom, and I bought formply at Bauhaus: https://www.bauhaus.se/basform-12x600x2500mm
"Water and boil-resistant glued form plywood made of poplar veneer, meg (120g/m²) dark film on two sides. Usage: For simpler form casting, cladding, and protection etc."
That's what it says about it, but now that the molds have stood for 1½ weeks waiting for concrete, it's rained a lot, and several of the edges have cracked on the boards with large cracks. Even in the middle of the boards, there have been bulges in some places.
It seems that it's primarily the "original edge" that is cracking, and where I have sawn them, they hold up better.
Bauhaus thinks they can compensate me for the boards that have cracked/become bubbly, which they estimate is two boards (out of 12). That I have to redo the work and bring in craftsmen again (which I have already paid for once) Bauhaus does not think they need to compensate for...
"Water and boil-resistant glued form plywood made of poplar veneer, meg (120g/m²) dark film on two sides. Usage: For simpler form casting, cladding, and protection etc."
That's what it says about it, but now that the molds have stood for 1½ weeks waiting for concrete, it's rained a lot, and several of the edges have cracked on the boards with large cracks. Even in the middle of the boards, there have been bulges in some places.
It seems that it's primarily the "original edge" that is cracking, and where I have sawn them, they hold up better.
Bauhaus thinks they can compensate me for the boards that have cracked/become bubbly, which they estimate is two boards (out of 12). That I have to redo the work and bring in craftsmen again (which I have already paid for once) Bauhaus does not think they need to compensate for...