Installing cabinets on a metal stud wall requires some special considerations to ensure they are properly secured and supported. With the right blocking and construction techniques, you can create a strong base for mounting cabinets on this type of wall framing.
Introduction
Metal stud walls are increasingly common in modern construction. They offer benefits like strength, thin profile, and resistance to mold or pests. However, mounting cabinets directly to the thin metal framing is often inadequate. Using blocking establishes thick mounting surfaces and strengthens the walls. Learning proper methods for installing blocking will give you the confidence to mount cabinets securely.
Preparing the Wall
Before installing blocking, ensure the metal stud wall itself is properly constructed. Metal studs are typically spaced 16 inches or 24 inches on center. They should be properly fastened at top and bottom plates with screws. Any insulation and drywall should be installed after blocking.
Blocking Options
You have a few choices when it comes to materials for blocking in a metal stud wall:
- Wood – 2x lumber is an affordable option. Use kiln-dried stud grade.
- Steel – Use light gauge steel studs or strut channels. Sturdier for heavy cabinets.
- Plywood – Good for large areas like behind a sink. Handles moisture better than wood.
Where to Install Blocking
Anywhere a cabinet will be mounted will need blocking. Consider:
- Behind wall cabinets spaced for each stud cavity.
- Between studs for Nosings or trim.
- Below base cabinets and above uppers for fastening.
- Near plumbing for anchoring adjacent cabinets.
Also add blocking at major appliances like stoves or dishwashers.
Installing Horizontal Blocking
To install a horizontal blocking board between studs:
- Measure and cut wood/steel blocking to fit snugly between studs.
- Drill holes slightly larger than fasteners.
- Use self-tapping screws to fasten blocking to metal studs.
- Check for straightness using a level.
Repeat at all desired heights for cabinet mounting.
Installing Vertical Blocking
For vertical blocking behind cabinets:
- Measure desired length, allowing to span from top to bottom plate.
- Cut wood or steel stud to size.
- Fasten through drywall or sheathing into studs.
- Use multiple fasteners top and bottom for strength.
- Make sure blocking at adjacent studs is aligned.
Securing Cabinets
With blocking installed, you can now securely mount cabinets:
- Use specs to locate studs, then pre-drill holes.
- Add shims to level and plumb cabinets.
- Attach to blocking using cabinet screws or bolts.
- For added strength, also attach sides to wall studs.
Tips for Success
- Always use appropriate length screws. Improper fasteners can miss blocking or studs.
- Apply construction adhesive between blocking and wall for increased stability.
- Blocking for upper cabinets should extend to ceiling. Use anchors or blocking above.
- Building codes may require specific types of fasteners or metal studs. Check first.
Conclusion
With the right techniques, blocking can provide the substantial mounting surface needed to properly install cabinets on metal stud walls. Take accurate measurements, use sturdy materials, and anchor into studs. Be sure to plan locations carefully based on cabinet layout. A little time spent on blocking will prevent headaches later and result in a quality, finished installation.
Frequently Asked Questions About Blocking for Cabinets in Metal Stud Walls
What type of screws should be used to attach the cabinet to the blocking?
Self-tapping metal screws are generally recommended when screwing into metal studs or framing. For wood blocking, coarse thread drywall or decking screws are a good option.
How much weight can blocking hold on a metal stud wall?
It depends on the type of metal studs, but generally metal stud walls can support cabinet loads comparable to wood stud walls when proper blocking is installed. Gauge for metal studs and type of fasteners impact overall strength.
Should the metal studs be reinforced behind the blocking?
Adding an additional stud screwed into the original stud behind the horizontal blocking can provide more strength. Alternatively, steel strut channels can be used as very sturdy blocking.
Is it okay to just use vertical blocking in the stud bays?
While vertical blocking alone may provide adequate support in some cases, it’s best practice to install horizontal blocking as well. The combination provides maximum strength and anchoring options.
What is the minimum thickness for wood blocking?
2×4 stud grade lumber provides good thickness for cabinet mounting. Engineered wood made specifically for blocking is another option. Don’t use small strips of plywood.
How far should blocking extend past the cabinets on each side?
A good rule of thumb is to have the ends of blocking extend at least 3 inches past the cabinet on each side. This provides extra strength.
What kind of plywood should be used for blocking large spans?
Use at least 3/4 inch cabinet-grade plywood. Marine grade with no voids is also a good option for moisture resistance. Stay away from particle board.
Can metal studs be notched to fit blocking in after the fact?
This is not advisable, as notching studs severely weakens them. Blocking should be installed before finishing the wall for best results.