loft boards

[tom1]

I do not think that was being questioned, more that they are joists, not rafters and can be drilled. I would still not recomend doing that on a cieling you plan to put any weight on (i.e. stand) even if its not prohibited.

yes i think your right, relised after i read your other post

 

[androiduk2002]

http://farm4.static.flickr.com/3465/3241636882_f9d4592e28.jpg

Applaud Smiley Applaud Smiley Applaud Smiley Applaud Smiley Applaud Smiley

And theres me wondering why I was running out of space

 

[Bez]

I am refering to the cieling joists that the finished cieling for the room below is attached to not the trusses, rafters, purlins etc..

"No part of a timber roof should ever be cut, modified, remove or the covering of the roof changed (i.e. replacing a slate roof covering by a concrete tile covering) without consulting a structural engineer."

Joists form part of the roof

 

[ianmacd]

"No part of a timber roof should ever be cut, modified, remove or the covering of the roof changed (i.e. replacing a slate roof covering by a concrete tile covering) without consulting a structural engineer." Joists form part of the roof

No they do not. The collar ties keep the rafters together along with being attached at the wall plate. It's not uncommon to have rafters (and collar ties) at 900 centres and cieling joists (they are not called roof joists ) at 450 centres to accept the finished surface.

 

[Evans Electric]

Ceiling joists are only sized to carry the ceiling , hence smaller than floor joists,hence do not drill, counter batten before boarding or re-route the cables.

Deke