How to install a C24 timber post?

mobius · 9 Aug 2008

Aloha

I've a pretty drawing from a structural engineer which says that the wooden beam currently spanning the width of my downstairs needs support in the form of a 100 by 100 C24 post. The room has a concrete floor.

After a rather questionable quote from a builder, what I'd like to know is:

1. What would be the correct way to install this post (are there certain brackets/fixings which should be used, does it need to go deeper into the floor, etc)?

2. Where can I get a C24 timber post?!

All suggestions and patience much appreciated, I'm a relative amateur to this

Deluks · 9 Aug 2008

Why not ask the engineer? Did he not specify or draw a pretty looking bracket or footing?

mobius · 10 Aug 2008

Deluks said:
Why not ask the engineer? Did he not specify or draw a pretty looking bracket or footing?

Because I'd rather ask here. Because I may have further questions in future. Because that, I believe, is what this forum is for. I'm not sure why you have a problem with that, or the way I speak.

freddiemercurystwin · 10 Aug 2008

mobius said:
2. Where can I get a C24 timber post?!

From a builders merchant

mobius said:
I'm a relative amateur to this

Thats obvious!

mobius said:
Deluks said:

Why not ask the engineer? Did he not specify or draw a pretty looking bracket or footing?

Click to expand...

Because I'd rather ask here. Because I may have further questions in future. Because that, I believe, is what this forum is for. I'm not sure why you have a problem with that, or the way I speak.

You've misunderstood what Deluks is saying, you've paid an engineer already for this, as its his design he should be your first port of call. Jeez some people.

mobius · 10 Aug 2008

Okay, sorry, my bad.

I hadn't thought to ask the engineer. I'll give that a try.

noseall · 10 Aug 2008

mobius said:
Because I'd rather ask here. Because I may have further questions in future. Because that, I believe, is what this forum is for. I'm not sure why you have a problem with that, or the way I speak.

this is a diy forum not a freebie-engineers giveaway.

Deluks was not being rude or had any intention of it.

^woody^ · 11 Aug 2008

Yes, how the load is transfered, and how the support is fixed is all part of the equation. And don't let the engineer get away with1\2 a job.

You'll need to go to a main supplier or ask for a special order from a general merchants, as c24 is not a stock grade.

I also wonder what extra strengh a c24 post has when used in compression.

Shytalkz · 11 Aug 2008

What are you on about Woody?

C24 = old SC24 grade = even older SS grade = standard stock grade.

From TRADA website ooi:

What is C16 or C24?
These are softwood strength classes. A strength class is simply a group of species/strength grade combinations which have similar strength/mechanical properties. There are a number of C strength classes but C16 and C24 are the two most commonly used. There are also hardwood strength classes which range from D30 to D70.

Allowable basic compressive stress parallel to the grain for C16 = 6.8N/mm^2; for C24 = 7.9N/mm^2.

The SE should have given an idea of the fixings top and bottom though...

^woody^ · 11 Aug 2008

What I am on about is that c24 (old sc4

) is not commonly stocked, despite what TRADA may say. If you are lucky, some 4x2 may be in the corner of the yard, but other than that it is not that common to get hold of.

Even two of my local trade only mechants which have massive timber stocks don't have c24 on the shelf except some in 4x2 and some 8x2.

Shytalkz · 11 Aug 2008

Soz, forgot you were in the land where rough-hewn bits of tree are still all the rage in building

.

Plentiful here bud.

I meant SC4, but well spotted nevertheless

DoctorC · 14 Aug 2008

my extension is all C24. piece of cake to source it.

Ask the Engineer - if he specified a C24 post, he should specify fixing details.

your Engineer's Professional Indemnity Insurance will not cover your house falling on your head if it is fixed to details found on an internet forum.

It will pay out if you use his details. (saying that, if you use his details, it should work!)

mikric · 14 Aug 2008

My local builders merchant is also licensed timber grader, when I needed c24 spec timbers for a job he just picked out some decent c16, regraded it to c24 and charged extra for it

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How to install a C24 timber post?

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