Detail to tie existing masonry wall to existing joists
Detail to tie existing masonry wall to existing joists
(OP)
I'm trying to work out a simple detail to tie existing masonry walls (front & rear facade) to existing timber joists that are running parallel. This is for 3-4 story brownstone style buildings with timber joists that span side wall to side wall.
The most basic detail is the old star on the exterior with a threaded rod through several joists. Assuming that I can't have anything on the exterior the next option is a similar detail but using an epoxy anchor into the masonry from the inside. Fitting a rod through the joists seems difficult unless the holes are significantly oversized. I am also assuming that the subflooring is remaining so no straps or access from the top of joist.
I've seen a few variations on this but none of them appear very easy to install. Does anyone have anything that they have used successfully?
The most basic detail is the old star on the exterior with a threaded rod through several joists. Assuming that I can't have anything on the exterior the next option is a similar detail but using an epoxy anchor into the masonry from the inside. Fitting a rod through the joists seems difficult unless the holes are significantly oversized. I am also assuming that the subflooring is remaining so no straps or access from the top of joist.
I've seen a few variations on this but none of them appear very easy to install. Does anyone have anything that they have used successfully?






RE: Detail to tie existing masonry wall to existing joists
As you said, the rods are normally anchored by masonry stars on the outside, and all rods are two piece with a turnbuckle for tightening. If you can't use the stars, why not epoxy allthread into the wall, and connect to the turnbuckle. If you don't want to use allthread full length, you could connect the allthread to a rod threaded only at the end using a rod coupler.
RE: Detail to tie existing masonry wall to existing joists
I have not typically gone the full length of the building, I'm not sure this is necessary - this is another issue though. I do provide staggered blocking as you said.
RE: Detail to tie existing masonry wall to existing joists
uk i've used this system many times. I guess it depends on how out of plumb the wall is. If it is a large concern I would do as Spats has described
Kieran
RE: Detail to tie existing masonry wall to existing joists
The walls are not out of plumb, they are in good shape. The buildings are being renovated and as part of that process we are incorporating ties. The facades are landmarked and we have been asked to avoid penetrating from the exterior. I'm trying to figure out if that is realistic.
RE: Detail to tie existing masonry wall to existing joists
RE: Detail to tie existing masonry wall to existing joists
My understanding of the increased effectiveness of the old star is that it captures a greater area of the wall and utilizes the length of the perimiter of the star to activate more of the wall in shear.
RE: Detail to tie existing masonry wall to existing joists
RE: Detail to tie existing masonry wall to existing joists
There are obviously lots of ways to do this. I was just wondering if anyone had seen or come up with anything easy and clever to avoid touching the exterior.
RE: Detail to tie existing masonry wall to existing joists
RE: Detail to tie existing masonry wall to existing joists
RE: Detail to tie existing masonry wall to existing joists