what type of found for hollow core?

MrLNB

Hi all, fellow builders.

I am in the planning process (late stages)

Its a bungalow with say converted upstairs with velux.

After much deliberation we are going to put in a concrete second floor, either T-Beams or actual H-Core.

my question is, what type of found can i put in. I know it will require like block on flat where beams/h-core is applying pressure,

but can I still have a strip found as oppose to raft..

I always thougt that a raft was for poor land.

Im on a bed of lime stone. . Grave/sandy/limestone.

appreciate a few comments.

Ps, my sister is paying through the roof for a raft with engineers/steel etc. ., I keep asking why why why.

LNB

sinnerboy

It depends on your ground conditions . I have used hollow core many times with strip footings

Your engineer will decide based on a site assessment - trial holes

MrLNB

ok thanks,

is it much cheaper to go strip? suppose you had any size bungalow, what would the difference be on a strip for it versus raft?

LNB

RKQ

Strip foundations are usually fine, subject to Engineer spec.

Conc hollow core slabs have other extra expenses too:-

• Steel lintols on all window and door opes (inner leaf)
• Steel lintols over certain internal door opes.
• Column or steel hangers around stair ope.
• 215mm wide wall in centre of structure, to support 2 slabs.

Could be alot of cash just for an attic - IMO only worth considering if attic can be converted to Habital rooms.