Ch#D4: Topic 4 – Frame Interior Partitions

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Topic 4 – Frame Interior Partitions

Layout and Preparation

Interior partitions are assembled in a very similar way to exterior walls. Non load-bearing partitions, however, do not require lintels and are not sheathed.

– Mark both sides of partitions with a chalk line on the floor

– Layout longest walls first and decide which walls will intersect or run through

– The vapour barrier must be continuous at partition and exterior wall intersections, place a piece of poly behind intersecting walls

Interior Passage Doors

Calculating the rough opening for interior doors is done in a very similar manner to exterior doors. As with exterior doors, the measurements given are for the door slab. To find the rough opening dimensions, we need to make additions:

– To the door slab width, we need to add the following:

½” clearance on each side (1” total)
¾” for jambs on each side (1 ½” total)

– To the door slab height, we will add the following (from top to bottom):

½” clearance
¾” for jamb
½” clearance over flooring
Thickness of flooring (given, can range from 1/8” to 1” or more)
Thickness of underlayment (if used)

For example, calculate the rough opening for an interior door 2’-6” x 6’-8” over 1” of carpet with 3/8” underlayment:

R period O period W i d t h equals 30 plus 1 quotation mark open paren c l e a. r a. n c e s close paren plus 1 open paren 1 divided by 2 close paren quotation mark open paren j a. m b s close paren equals 32 open paren 1 divided by 2 close paren

R period O period H of e i g of h of t equals 80 plus 1 divided by 2 quotation mark plus 3 divided by 4 quotation mark open paren j a. m b close paren positive 1 divided by 2 quotation mark plus 1 times open paren 3 divided by 8 close paren prime prime times open paren c a. r p e the tangent of d u n d e r l a. y m e n t close paren equals 83 times open paren 1 divided by 8 close paren prime prime

R period O period f of o r t h of e a. b o v e d o o r equals 32 one half right double quotation mark times 83 open paren 1 divided by 8 close paren right double quotation mark

Bifold Doors

The rough opening for Bifold doors is done differently. Bifold door sizes are sized according to their openings (ex: a 36” x 80” bifold door will have a finished opening of 36” x 80”). The clearances required for operation and hardware are taken included with this measurement. There are two primary methods used to finish a bifold door opening:

– Half Jambs (pictured below) – The opening is finished with drywall and a strip of jamb material is used to cover the bifold door where it meets the finished opening.

– No Jambs – Similar to half jambs but does not have the strip of jamb material nor casing applied on top.

Regardless of which method is used, the width of the rough opening is calculated the same:

B i minus f of o l d R period O period W i d t h equals N O M I N A L D o o r W i d t h plus D r y w a. l l T h of i c k n e s s open paren b o t h s i d e s close paren

***Example: what is the R.O. for a 48” (2-24”) bifold door with half-jambs and ½”
drywall on both sides?

R period O period W i d t h equals 48 right double quotation mark positive one half right double quotation mark positive one half right double quotation mark equals 49 right double quotation mark

The R.O. height for the two methods above is done in a similar way but must include flooring and underlayment. Remember, the clearance for operation and hardware is included in the nominal door measurement:

***Example: what is the R.O. for a 36” x 80” bifold door with half-jambs and ½”
drywall, and 1” carpet with ¼” underlayment?

R period O period H of e i g of h of t equals 80 right double quotation mark positive one half right double quotation mark positive 1 right double quotation mark positive one fourth right double quotation mark equals 81 and three fourths right double quotation mark

The third method of framing bifold doors is using jambs. This method is used much less due to the added cost and time. Just as before, the finish opening needs to be equal to the nominal dimensions of the bifold door. With this method the jamb thickness (typically ¾”) and clearance (1/2”) from each side to the nominal width. The ½” clearance, jambs, and flooring (including underlayment) is added to the height.

***Example: what is the rough opening for a 24” x 80” bifold door using ¾” jambs, and ½” laminate flooring with no underlayment?

R period O period W i d t h equals 24 right double quotation mark positive 1 and one half right double quotation mark open paren j a. m b s close paren plus 1 right double quotation mark open paren c l e a. r a. n c e s close paren equals 26 and one half right double quotation mark

R period O period H of e i g of h of t equals 80 right double quotation mark positive one half right double quotation mark open paren c l e a. r a. n c e a. t t o p close paren plus three fourths right double quotation mark open paren j a. m b close paren plus one half right double quotation mark open paren f of l o o r i n g close paren equals 81 and three fourths right double quotation mark

Clearances for Bathtubs

A standard bathtub is 5’-0” wide; an extra ¼” must be added and partitions around a tub must be 5’-0 ¼” apart. There should also be no studs placed in the center of the side nor each end (8” away from the center of the tub) to allow clearances for plumbing and soap grabs.

Clearances for Chimneys

While less common now with high-efficiency furnaces and water heaters, interior chimneys require 2” of clearance from combustible materials. Partitions must be a minimum of 50 mm (2”) away from chimneys on all sides (see 9.21.5.1 in NBC). Exterior chimneys require a clearance of 12 mm (1/2’).

Sound Control

There are a number of methods which can be utilized to control sound transmission through partitions:

– Insulate the stud spaces

– Stagger wall studs

Use a plate 1 size bigger than studs
Install double wall with staggered studs

– Installing metal resilient bar between studs and drywall

Review Questions

Prior to nailing the double plate on an interior partition _____.

a) The wall must be straightened

b) The wall should be erected

c) The wall should be square

d) A vapour barrier should be installed

True or False:

a) The bottom plates should run through all openings until the walls are securely nailed in place.

b) The purpose of a staggered stud wall is to increase sound control.

What is the minimum size studs that can be used in a non load-bearing partition?
What is the maximum sized hole that can be cut through a 2×4 wall stud in:

a) Non load-bearing

b) Load-bearing

The rough opening for a 2’-6” x 6’-8” door (3/4” jamb stock, 1” carpet, 3/8” underlayment) is:

a) 2’-6” x 6’-8”

b) 2’-7 ½” x 6’-9 ¼”

c) 2’-7 ¼” x 6’-10 1/8”

d) 2’-8 ½” x 6’-11 1/8”

What rough opening is required for a 32” x 80” passage door with ¾” jambs, 1/8” laminate flooring and 5/8” underlayment?
The finished opening for a 4’-0” x 6’-8” bifold door using ½” drywall on top and both sides would be:

a) 4’-0 ½” x 6’-8 ½”

b) 4’-1” x 6’-8 ½”

c) 4’-0” x 6’-8 ½”

d) 4’-0” x 6’-8”

What R.O. is required for 2 – 36” x 80” bifold doors with 3/4” half jambs and 3/8” drywall, and 3/8” laminate flooring?
What R.O. is required for a 2’-8” x 6’-8” passage door with ¾” jambs, 5/8” subflooring, ½” underlayment and 1” carpet? (Walls are finished with ½” drywall)
What R.O. is required for a 2’-8” x 6’-8” bifold door with no jambs, 3/8” drywall, and ½” vinyl plank flooring with ¾” subfloor?

Answers:

D
1. True
2. True
38×38 @ 400 O.C. (9.23.10.1)
1. 40 mm
2. 29 mm (1/3 the stud width) (9.23.5.3)
D
34 ½” x 82 ½’
D
72 ¾” x 80 ¾”
34 ½” x 83 ½”
32 ¾” x 80 7/8”

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Carpentry Refresher Program Manual Copyright © by Saskatchewan Indian Institute of Technologies-Trades and Industrial is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.