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Attaching 2x4 wall to duplex party wall

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Posted by: from Winnipeg
5/14/2019 at 2:59:31 PM

Looking to close off the furnace room in a duplex but the wall will have to attach to the fire rated party wall between studs. Can I take off the fire rated drywall (carefully), put in a 2x4, and cover up with the drywall again, then attach the new wall to the party wall over the drywall?

Attaching 2x4 wall to duplex party wall
REPLIES (2)
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Cornel from Steopan Remodeling in Coquitlam
Date/Time5/14/2019 at 9:08:26 PM

Hi, If a party wall complies with state fire codes ,it willmost likely comply with other building codes as well.

Two separate Walls. Although it s not noticeable from the curb , in new apartament buildings, there s a good chance that the party walls are two separate walls covered by siding that makes the conplex apper to be a single structure.

Staggering Wall Studs. If code allows , it s possible to construct a single Party wall by Staggering the studs and using larger Dimension floor and ceilling plates .This result in a wider than standard wall.

Considerations. you get one shot at building the party wall , and while building codes regulate the minimum level of fire and structural protection, they don t take comfort and privacy into consideration. By adding a layer of acoustical laminated drywall over an inspector approved fire rated party wall , you can further dampen sound transfer between tenants . Installing fabric wrapped wall panels offers additional Privacy.

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Date/Time5/15/2019 at 6:50:38 AM

Yes you can. Your party wall drawing looks suspicious as it wouldn't meet Code requirements for sound transmission which would require as a minimum 2 x 6" plates with staggered 2 x 4 studs (something the other respondent eluded to).

You might want to attach the new wall using screws to help suck the two walls together as the additional drywall thickness will reduce the penetration of conventional spikes. Also make sure the replacement drywall is the fire-rated variety and correct thickness (whether 1/2" or 5/8") to match the existing materials.

You will also need to make sure the drywall joints are taped to maintain the fire separation.

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