On Jan 28, 9:00 pm, Charlie Morgan wrote:
..... sistering is construction reinforcement where you attach
an additional timber to an existing one to add strength.


Wrong

For example (as Jeff said) a frame in a wooden boat can be sistered
but the new frame isn't attached to the old one.

-signed- Injun Ear

On 29 Jan 2007 11:14:01 -0800, wrote:



On Jan 28, 9:00 pm, Charlie Morgan wrote:
..... sistering is construction reinforcement where you attach
an additional timber to an existing one to add strength.


Wrong

For example (as Jeff said) a frame in a wooden boat can be sistered
but the new frame isn't attached to the old one.

-signed- Injun Ear


From Hammerzone.com but many other references

What Is Joist "Sistering"?

Sistering a joist simply means attaching more material to the side of
the joist. This can mean a new joist of the same size and length is
screwed or nailed firmly to the old joist, or it can be a smaller
structural member. Sistering could also involve sandwiching the old
joist with new material on both sides. Typically this involves framing
lumber, but it could involve engineered lumber, structural steel or
formed steel joists that are made of heavy gauge sheet metal.

On Jan 29, 4:05 pm, Frank Boettcher wrote:
From Hammerzone.com but many other references

What Is Joist "Sistering"?

Sistering a joist simply means attaching more material to the side of
the joist. This can mean a new joist of the same size and length is
screwed or nailed firmly to the old joist, or it can be a smaller
structural member. Sistering could also involve sandwiching the old
joist with new material on both sides. Typically this involves framing
lumber, but it could involve engineered lumber, structural steel or
formed steel joists that are made of heavy gauge sheet metal.

That may be true of joists but not boat frames.

BTW to call somebody a "house carpenter" is is considered an insult
among boatbuilders.

-signed- Injun Ear (formerly known as Eagle Eye)

On 29 Jan 2007 13:43:33 -0800, wrote:

On Jan 29, 4:05 pm, Frank Boettcher wrote:
From Hammerzone.com but many other references

What Is Joist "Sistering"?

Sistering a joist simply means attaching more material to the side of
the joist. This can mean a new joist of the same size and length is
screwed or nailed firmly to the old joist, or it can be a smaller
structural member. Sistering could also involve sandwiching the old
joist with new material on both sides. Typically this involves framing
lumber, but it could involve engineered lumber, structural steel or
formed steel joists that are made of heavy gauge sheet metal.

That may be true of joists but not boat frames.

You jumped into the thread on a post that indicated that the term was
not specific to marine joinery and indicated what was said above was
not true. That's why my response.


BTW to call somebody a "house carpenter" is is considered an insult
among boatbuilders.

-signed- Injun Ear (formerly known as Eagle Eye)

Frank Boettcher wrote:
You jumped into the thread on a post that indicated that the term was
not specific to marine joinery and indicated what was said above was
not true. That's why my response.


Sorry, I figured we were talking about boats. I have put in sister
frames on a wooden boat, and they are not attached to the old frames.

Now I'm curious, when one reinforces a fiberglass structure by putting
on more cloth, is that called "sistering?" Seems to fit the
definition, but fiberglass boat work is generally not given the
respect of using it's own technical terms the way old-time wood woork
is.

-signed- Injun Ear (formerly known as Eagle Eye)

Sistering is a very inefficient way to increase the strength of a member.
Doubling the member's thickness only doubles it strength. Increasing it's
width (or height) increases the strength as the cube of the dimension.
{Deflection ~ Young's modulus x moment of inertia}.

I'm Ted Bell!




wrote in message
oups.com...


On Jan 28, 9:00 pm, Charlie Morgan wrote:
..... sistering is construction reinforcement where you attach
an additional timber to an existing one to add strength.


Wrong

For example (as Jeff said) a frame in a wooden boat can be sistered
but the new frame isn't attached to the old one.

-signed- Injun Ear