I am going to extend my house and have received a lot of quotes from local building suppliers, but I also found a company online that sold roof trusses. They had a cheaper price than my local suppliers. Since there are new regulations that all roof trusses must be CE marked, I don't want to make them myself, and considering the prices, it's not worth spending time on it either. Now I have two inquiries:
1. Has anyone purchased from this company before, www.wramstra.se, and can recommend them if so?
2. Is there anyone else who knows of a place online where you can buy roof trusses?
Thanks in advance for the help.
1. Has anyone purchased from this company before, www.wramstra.se, and can recommend them if so?
2. Is there anyone else who knows of a place online where you can buy roof trusses?
Thanks in advance for the help.
Correct thinking, in my world.xelton said:
Check what price you get here: They've been really sharp in the past:
http://www.takstolsfabriken.se/
I have no idea about Wrams....
And by the way, make sure all the quotes you get include shipping, as it's a significant cost.
A bit off topic. The requirement for CE marking generally applies to products that are sold. That is, IF you purchase roof trusses, they must (apparently) also be CE marked.
But if you choose to make them yourself, it should be OK. However, you must be able to show structural calculations and some form of inspection protocol to ensure the construction has been followed. Inspection is often acceptable as "self-control".
In practice, it is probably always more profitable to buy ready-made roof trusses from a factory, which always come with ready-made structural calculations, rather than first hiring a designer to create the plans and then manufacturing them yourself. Factories also use pressed nail plates for joining, which can only be done on an industrial scale. This allows the use of smaller dimensions in certain parts of the truss, so that the material usage is also lower for the factory-made ones.
The only situation where I can imagine it being worthwhile to make them yourself is when there are either such small or few roof trusses that the transportation cost from the factory becomes disproportionately high in relation to the cost of the trusses.
But if you choose to make them yourself, it should be OK. However, you must be able to show structural calculations and some form of inspection protocol to ensure the construction has been followed. Inspection is often acceptable as "self-control".
In practice, it is probably always more profitable to buy ready-made roof trusses from a factory, which always come with ready-made structural calculations, rather than first hiring a designer to create the plans and then manufacturing them yourself. Factories also use pressed nail plates for joining, which can only be done on an industrial scale. This allows the use of smaller dimensions in certain parts of the truss, so that the material usage is also lower for the factory-made ones.
The only situation where I can imagine it being worthwhile to make them yourself is when there are either such small or few roof trusses that the transportation cost from the factory becomes disproportionately high in relation to the cost of the trusses.
I also believe that both CE marking and calculation with euro-code are things that only apply to those who manufacture professionally for others. Self-built chairs are probably exempt. However, you end up somewhat in the hands of the building committee and the possible quality responsible ... sorry, it's called control responsible now! They can either approve your self-built ones without protest, or complicate things greatly, essentially requiring calculations, drawings, and everything under the sun. Some things they certainly have the right to require, others perhaps not, but they try anyway.
But I have a version of a simpler roof truss program, the roof book by Bjerking. That is, it's a really competent program that calculates correctly. The simplification lies in a lot of limitations on truss types and roof pitch. If anyone is in need of calculation and drawing, I'm happy to help.
The roof truss factories, however, are hard to beat on price. A highly rationalized production with a high degree of automation, large purchase volumes of construction-grade timber, and nail plates allow them to significantly cut prices while maintaining margins. I would like to generalize and claim that trusses with spans of about 3-5 meters and above are not profitable to make yourself. But as usual, rules of thumb don't always apply...
I hammered together the one for the shed myself, span 2.5 meters, definitely profitable. And for the garage, span 4 meters, it was actually profitable as well. But if I hadn't first "practiced" on making the shed's, it wouldn't have gone as quickly and therefore wouldn't have been profitable (with any reasonably set self-hourly rate, I usually see my hourly rate as about 150:/hour, when I work for myself). For the house, we bought trusses, and I don't regret that for a second.
But I have a version of a simpler roof truss program, the roof book by Bjerking. That is, it's a really competent program that calculates correctly. The simplification lies in a lot of limitations on truss types and roof pitch. If anyone is in need of calculation and drawing, I'm happy to help.
The roof truss factories, however, are hard to beat on price. A highly rationalized production with a high degree of automation, large purchase volumes of construction-grade timber, and nail plates allow them to significantly cut prices while maintaining margins. I would like to generalize and claim that trusses with spans of about 3-5 meters and above are not profitable to make yourself. But as usual, rules of thumb don't always apply...
I hammered together the one for the shed myself, span 2.5 meters, definitely profitable. And for the garage, span 4 meters, it was actually profitable as well. But if I hadn't first "practiced" on making the shed's, it wouldn't have gone as quickly and therefore wouldn't have been profitable (with any reasonably set self-hourly rate, I usually see my hourly rate as about 150:/hour, when I work for myself). For the house, we bought trusses, and I don't regret that for a second.