The number of jack studs required depends on the size of the opening and the stud spacing. The International Residential Code (IRC) provides guidelines on this.
To determine the number of jack studs needed, consider the following:
- Size of the opening: The width of the door or window opening greatly affects the load that needs to be supported. Larger openings require more support.
- Stud spacing: Typical stud spacing is either 16 inches on center (o.c.) or 24 inches o.c. Closer spacing generally results in a stronger wall.
Based on the provided reference (R603. 7 Jack and king studs.), the number of jack studs can be determined using the following table:
| SIZE OF OPENING (feet-inches) | 24-INCH O.C. STUD SPACING | 16-INCH O.C. STUD SPACING |
|---|---|---|
| > 5′-6″ to 8′-0″ | 1 | 2 |
| > 8′-0″ to 10′-6″ | 2 | 3 |
| > 10′-6″ to 12′-0″ | 2 | 3 |
| > 12′-0″ to 13′-0″ | 2 | 3 |
Important Considerations:
- The table specifies the number of jack studs per side of the opening. Therefore, the total number of jack studs for an opening would be double the numbers listed in the table. For example, for an opening between 5'6" and 8'0" with studs spaced at 16" o.c., you would need 2 jack studs on each side, for a total of 4 jack studs.
- These are minimum requirements based on the IRC. Local building codes may have more stringent requirements. Always consult local building codes and a qualified professional.
- This code specifically references the 2015 IRC for New York. Requirements might vary based on the edition of the IRC adopted in your jurisdiction and any local amendments.
Therefore, to give a definitive answer to "How many jack studs?", more information is needed regarding the size of the opening and the stud spacing. Without these details, a precise number cannot be provided. The reference table provides possible answers based on different scenarios.
