×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Door Frame Replacement

Door Frame Replacement

Door Frame Replacement

(OP)
As part of a general structural repair of a suspended structural slab with corroded rebar, we have been asked to also specify the replacement of metal exit doors and metal frame due to advanced corrosion of these members in the 40 year old public library building. The doors which are the entrance to a fire exit stair of the library have to be 2 hour rated.

Questions:

1. How should we specify that the new metal door frame be attached to the wall? The wall is 4" brick and 6" block cavity wall. Do they have to take down the masonry and rebuild it around the head and jambs of the new frame?

2. Does the 2 hour rating require anything special for the frame installation? For example, should the hollow space created by the frame be filled with grout? If so, I suppose it would have to be a liquid grout pumped in thru some access ports?

RE: Door Frame Replacement

The door frame can be anchored to the masonry with countersunk bolts into sleeve anchors (usually 3 places equally spaced over height). Door frames should be filled with grout. Check your governing code as to whether the lintel needs to have a fire rating.

RE: Door Frame Replacement

Thanks Jike - aren't the door frames made of relatively thin metal (20 gauge or so?) and as such I don't see how the bolt heads can be countersunk...unless you mean to fill the frame with grout and then countersink the bolt head thru the metal frame and into the grout?

RE: Door Frame Replacement

In the door jambs we receive for installation in masonry the metal jamb is dimpled and then the dimple is drilled to provide a hole for the bolt to pass through. the dimple provides a recess for the countersunk bolt head to nest into. Thus a countersunk bolt. The bolt may be a tapcon or similar threaded piece, not a headed bolt.

I hope that was clearer than mud.

Jim

RE: Door Frame Replacement

(OP)
Thanks jimstructures - that is very clear and well explained. Assuming that the frame has to be grout filled for 2 hour fire rating, how is that done? Do they drill hole near the top and then inject in a flowable cementitious grout into the frame head and jambs? Or is it not necessary to fill the frame?

RE: Door Frame Replacement

We fill the frame by leaving a 2"+ gap over the door frame to enable flowable grout to enter the two vertical spaces between existing masonry and new frame, then dry-pack overhead gap.

RE: Door Frame Replacement

(OP)
Thanks Ingenuity. Much appreciated.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources