Attaching a support beam to aerated concrete

[m@nge]

I'm planning to build a deck and have a question regarding the bearer beam.

The bearer beam (120x95) is to be screwed onto the foundation, which consists of some kind of lightweight concrete. It's a type of gray/blue stone that is relatively porous.

Is it sufficient to pre-drill the frame/concrete block, insert something like tec7, and then screw in facade plugs?

 

[Demmpa]

I would have skipped attaching it to the foundation, I would have placed the carrier beam 300-500 out from the foundation.
I would have dug down adjustable piers at all the locations.

OT, when you write that it is gray-blue lightweight concrete, my thoughts go towards it being blåbetong that can emit radon, how much depends on where in the country the alunskiffer comes from, the alunskiffer contains uranium in varying concentrations.

 

[m@nge]

It's not blue concrete, I have done a radon investigation and there's nothing in the building material.

I have very rocky ground so I'd rather avoid digging for pillars. I will have some of course, but I prefer to use a support beam against the foundation to keep the number of pillars down.

But what do you think about tec7, it should stabilize the plug a bit, right?

 

[GoForIt]

Use special plugs designed for lightweight concrete/LECA.

Is the support beam really 120x95? Seems very sturdy...

 

[Nicro]

Use anchor mass and threaded rod, it is the strongest fastening.

 

[m@nge]

Was thinking tec7 since I had it at home.

 

[Nicro]

Thought about tec7 since I had it at home.

Unfortunately, it won't be better just because you have it at home.

Anchor mass is best, then I would say facade plug in this case. Without glue. Drill a hole 1 mm smaller than the plug.
A facade plug with a 90 mm expansion part.

 

[Villa1949]

I recently attached a ledger board to my foundation of concrete blocks. I used Essve facade plugs which were 10x160, worked well so far. My ledger board was 45 thick so the plug went about 10 cm into the wall. I placed some pieces of foundation paper as spacers between the wall and the board at each fastening to allow some air behind the board.

 

[jonaserik]

Planning to build a deck and have a question about the beam.

Whatever you do, do not place the beam tightly against the foundation, debris will accumulate between the beam/foundation as well as some on top. Perfect breeding ground for rotting wood. The beam should be mounted at least 2 cm out from the foundation, spacers are suitably made using 45X95 placed on edge against the foundation and oiled. Then you can easily rinse with a water hose maybe every two years.

 

[m@nge]

Too late. The deck's beams have been in place for about 15 years and nothing is rotten. What I have done is extend the deck.

 

[jonaserik]

Don't know what it looks like, but maybe the late part is sitting under a protruding eaves. Just for you to enjoy.

 

[m@nge]

No, the eaves do not cover the innermost decking board with the beam underneath. But as mentioned, it has been there for a long time and still feels fresh.