Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Windows and Doors

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-23-2011, 10:30 PM   #1
Newbie
 
Join Date: Oct 2009
Location: Wisconsin
Posts: 19
Rewards Points: 10
Default

How To Size a Prehung Door?


My question is about how to determine whether a pre-hung door will work for me. The rough opening for my interior door measures 34" wide x 813/8" high with a wall width of 41/2"

I stopped at a Lowes and found a door that is designed to fit a 34" wide x 821/2" opening. The door itself is 32" wide.

I'm good on all the dimensions except for the height. Is the 813/8" height of my rough opening mean that I will need a custom door?

Thanks in advance for any ideas on this

kc27 is offline   Reply With Quote
Old 10-23-2011, 11:00 PM   #2
43 years in construction
 
Arkitexas's Avatar
 
Join Date: Mar 2011
Location: Texas
Posts: 104
Rewards Points: 75
Default

How To Size a Prehung Door?


No, just cut the bottom of the frame and the door to fit the rough opening. The door needs to be undercut more than the frame to clear your floor finish. Allow 3/4" where carpet or ceramic tile will be installed. Allow 1/2" to 5/8" at sheet vinyl and vinyl tile. Exterior doors with a threshold vary depending on the threshold configuration.

Rick

Arkitexas is offline   Reply With Quote
The Following User Says Thank You to Arkitexas For This Useful Post:
kc27 (11-04-2011)
Old 10-23-2011, 11:00 PM   #3
Member
 
Join Date: Dec 2010
Location: BC Canada
Posts: 500
Rewards Points: 500
Default

How To Size a Prehung Door?


You should be fine with that door, although you may want to see if you can add any height to the opening, if not easily done (if there is a header you don't really feel like cutting) then you can always cut the bottom of the door a bit if there isn't enough room.

Typically a rough opening is 2-2.5 inches wider, as well as taller, than the door itself. So with a 32'' door, you should have an opening 34-34.5 or so wide, and 82-82.5 high.

Depending on how level the floor/subfloor is, and what kind of flooring is in place; or whether you are installing the door on top of finish flooring, you may need to cut the bottom of the door, and possibly jambs. Again, it might be easier to add more height to the opening first, before installing. I am assuming this is an interior door and will not have a sill/threshold, and as well is a wood door.

Your depth should match your size of framing plus drywall, so sounds like your door is for a 2x4 wall.
chrisBC is offline   Reply With Quote
The Following User Says Thank You to chrisBC For This Useful Post:
kc27 (11-04-2011)
Old 11-04-2011, 11:58 PM   #4
Newbie
 
Join Date: Oct 2009
Location: Wisconsin
Posts: 19
Rewards Points: 10
Default

How To Size a Prehung Door?


Thanks for the advice. I checked with the salesperson at Lowes, and he said the actual height of the jamb is 813/4", so may have a shot at enlarging the rough opening, I need to take a closer look tomorrow.

The salesperson said that if I decide to cut down the door I will need a table saw. I had been.planning on clamping a straightedge on the door and using my circular saw, because I do not own a tablesaw. Is that the wrong way to go? It's a solid core door with oak veneer, if that matters.
kc27 is offline   Reply With Quote
Old 11-05-2011, 01:35 AM   #5
Member
 
Join Date: Dec 2010
Location: BC Canada
Posts: 500
Rewards Points: 500
Default

How To Size a Prehung Door?


Personally I wouldn't cut it on a tablesaw, I would cut it with a circular saw and a clamped straitedge. Use a good finishing blade on the saw, with the blade extending about a quarter inch past the door. With a veneer it is a good idea to score it with a knife first on both sides to prevent chipping. As well use masking/painters tape where the saw will run will prevent scratching.

Personally i've never seen anyone run the bottom of a door through a tablesaw on a jobsite.
chrisBC is offline   Reply With Quote
The Following User Says Thank You to chrisBC For This Useful Post:
Willie T (11-05-2011)
Old 11-05-2011, 09:01 AM   #6
Ole Wood Worker
 
BigJim's Avatar
 
Join Date: Sep 2008
Location: Lookout Valley, Chattanooga, Tennessee
Posts: 7,588
Rewards Points: 2,348
Blog Entries: 1
Default

How To Size a Prehung Door?


No more than that is I would cut the header off, it is no fun but doable.
__________________
New members: Please consider adding your location to your profile.

Jim
BigJim is online now   Reply With Quote
Old 11-05-2011, 09:24 AM   #7
Member
 
MikeKy55's Avatar
 
Join Date: Nov 2009
Location: Louisville KY
Posts: 321
Rewards Points: 250
Default

How To Size a Prehung Door?


I glued and screwed a piece of 1 X 4 to a piece of 1/4" luan (both pieces about 40 inches long) and then ran my circular across with the edge of the saw tight against the 1 X. Now when I need to cut a door, I measure the door, clamp the guide I made to the door even with the marks and cut it with the circular saw using a fine tooth blade. Works great. I do score the face (top side) of the door with a box knife before making the cut. I have never had the underside of the door chip or splinter, always the top surface.
I just cut three doors and jams for my basement and had no issues.
__________________
'It's never too late to say ''THANK YOU'' to a veteran of our armed services'
MikeKy55 is offline   Reply With Quote
Old 11-05-2011, 01:52 PM   #8
Old School
 
Willie T's Avatar
 
Join Date: Jan 2009
Location: St. Petersburg, FL Minds of moderate caliber ordinarily condemn everything which is beyond them.
Posts: 3,634
Rewards Points: 2,000
Default

How To Size a Prehung Door?


I made four like this one, all various lengths, except that I used 1/2" MDF.

http://youtu.be/CH5dW-QcgeI

You just want to make sure you DO NOT use plywood, as that will eventually 'warp' or 'cup' or twist.

While you are at it, you can make one to use with your router, too.


BTW, Never, ever try to cut a door on your tablesaw. It is dangerous for a novice, and even experts resist doing it.

__________________
"True eloquence consists in saying all that is necessary, and only that which is."
François Duc de La Rochefoucauld
Willie T

Last edited by Willie T; 11-05-2011 at 02:05 PM.
Willie T is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need to replace front door, existing door non-standard size uncle Windows and Doors 1 07-25-2011 06:50 AM
Installing a prehung door on Metal studs tiago Building & Construction 2 07-18-2011 04:41 PM
Installing a Home Depot prehung interior door. John58 Building & Construction 4 10-31-2010 07:20 PM
Kohler shower door, tolerances, not sure which size to pick mslide Kitchen & Bath Remodeling 2 12-04-2009 11:08 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.