Anchoring a spine wall

[WWilts]

Double storey spine wall going down to foundations. 140mm concrete blocks till first floor joists. Then 100mm concrete blocks from first floor to ceiling of first floor (2300mm height).

 

Length of spine wall 1340mm (3 blocks long) at first floor level. So far built only 5 blocks high 

 

 

Concern: first floor single skin concrete 100mm block wall needs better anchoring because it rests partly on blocks but partly on the joists (that run perpendicular to the spine wall).

The joists are 2x10" C24. Topped by 18mm P5 chipboard surface.

pic: 140mm inspine wall with 2x10" joists resting on it. Concrete block infill.

 

Qu: What would help to anchor the base of the first floor concrete block spine wall to the first floor joists?

 

So far, thought of heavy duty brackets along the base of the wall, screwed down to joists through the chipboard

eg Simpson E9/2,5 Angle Bracket 65mm x 150mm x 150mm

 

 

 

[Gus Potter]

Good question about restraint.

 

These brackets are good but does this seem possible?

 

Build the 100mm block off the 140 block. Each side put full depth noggings (dwangs) hard against the 100 mm block within the depth of the floor joists.

 

The noggings will also serve to support the chipboard flooring edge and the noggings are then tied into the first floor diaphragm. Even what you have is recognised as an effective lateral restraint so the noggings will really do the business.

 

The 140mm block, although a pier looks suspect at first glance, will carry a lot of load as the joists above are loading the wall almost about its centre of gravity (photo 2). As the joists above are continuous the wall will attract more load, which acutally helps in a lot of cases to improve its resistance to lateral load.