Rip-Bead® Muddable J-Bead

Used to finish drywall edges when dissimilar materials and door and window encasements meet gypsum

Rip-Bead® Muddable J-Bead is designed to cover the raw edges of drywall when butting up to other materials such as masonry, glass, door frames and window frames.

Application(s): Drywall

Features a 1/4" removable leg that acts as a guide for the taping knife and a protective mask for joint compound application.



Step 1:
Make sure the surface of the drywall is clean and smooth. Avoid using the tapered edge for this application. Measure and cut the Rip Bead Muddable J-Bead to length subtract ½” for vertical applications. Dry fit the Rip Bead J-Bead to ensure the optimum fit.

Step 2:
Position the mud leg of the Rip Bead Muddable J-Bead so that it is facing the room’s interior. Slip the J-Bead over the edge of the drywall until both edges meet.

Step 3:
Install the drywall equipped with the J-Bead using screws as normal.

Step 4:
Staple the Rip Bead Muddable J-Bead every 6”– 8” with ½” staples while applying pressure by hand to keep the J-Bead tight to the drywall surface. 

Step 5:
Using a 6” taping knife, apply the first coat of joint compound to the surface of the Rip Bead J-Bead. The use lightweight compound or setting-type compound in this step will reduce shrinkage and speed up drying time. Let this dry completely, for several hours or overnight.

Step 6:
Using an 8” taping knife, apply the final coat of joint compound. Feather the compound beyond the previous coat. The use of all-purpose compound or topping compound will make for a more durable finish. Let this dry completely, for several hours or overnight.

Step 7:
Gently remove the Rip Bead removable leg after the final coat of compound is completely dry and before sanding.

Step 8:
Sand lightly with 120 grit sandpaper to finish.



ASTM & Code Standards

  • ASTM C1047 - Standard Specification for Accessories for Gypsum Wallboard and Gypsum Veneer Base
  • ASTM D1784 - Standard Specification for Rigid Poly Vinyl Chloride (PVC) Compounds and Chlorinated Poly Vinyl Chloride (CPVC) Compounds
  • ASTM D3678 - Standard Specification for Rigid Poly Vinyl Chloride (PVC) Interior Profile Extrusions
  • Installation: ASTM C840 - Standard Specification for Application and Finishing of Gypsum Board
  • SDS & Product Certification Information


All stored materials shall be kept dry.  Materials shall be stacked off the ground, supported on a level platform, and protected from the weather.


PRoduct submittal SHeets

Click the below Product Code to view Submittal/Tech Datasheet.

Product Code Description
TMJB50, TMJB58 Rip-Bead® Muddable J-Bead

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