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Pictorial Guide to Reinforcement Mulls

by Dec 9, 2019

INSTALLING REINFORCEMENT MULLS

The combining of multiple windows in large openings is called mulling. Mulled sets require windows to be permanently attached together during installation. Windows are mulled together with mull strips through the interior and exterior accessory pocket on all Ringer Windows. Very Large window Openings with multiple windows connected together may require reinforcement parts.

Reinforcement mulling requires a stiff metal reinforcement bar between windows to provide better stability of the mulled window set. These reinforcement stabilizer bars add 1/2″ spacing between windows. This pictorial blog will provides step-by-step guidelines for your installation using Reinforcement mulls.

 

Ordering Windows with Reinforced Mulls

When ordering Ringer Windows, please let your Ringer Windows representative know that which windows are going into one opening. Ringer Windows offers reinforcement parts for an additional charge, if requested. Reinforcement mulls may be ordered with any of Ringer Windows window products including stock windows.

CLICK FOR RINGER WINDOWS MULLING INSTRUCTIONS

Please refer to the section “INSTALLING MULLS USING REINFORCEMENT WITH A 1/2″ STRIP” in the mulling instructions.

Your reinforcement mulled window order will include your windows, reinforcement metal bar(s), 1/2″ mull strips, and L-Brackets for the reinforcement mull window installation. New construction reinforcement mulling will require the opening to be properly prepared for the window installation. Replacement window installations may require Vin-L-Hold fasteners and other accessory trims. These additional items may be purchased from Ringer Windows.

For this description and pictorial guide, this is for a 3 window replacement installation in brick. This 3 window set replacement window installation was in an opening size of 12′ x 7′. 

 

TO BEGIN – PREPARE OPENING

STEP 1: (For New Construction) FRAME OPENING and PREPARE FOR WINDOW SET

Use Ringer Windows new construction install guidelines for installing new windows. Prepare new framed opening for window installation.

 

STEP 1: (For Replacement) REMOVE OLD WINDOWS

Use Ringer Windows replacement window installation guidelines for replacement windows. Remove old windows and caulk. Prepare window opening for new window installation.

Removing the glass of the old window

Removal of Old Glass and careful handling

Glass removal for large windows takes two people

INSTALL WINDOW 1

STEP 2 – Plan – Measure – Mark Locations and Install 1st Window

Once you have a prepared opening, it’s now time to measure, mark, and remeasure windows and opening. It is critical to make sure the windows are going to fit with their reinforcement metal bar with 1/2″ mull into the opening. It is important to know the location of each of these windows in their openings. Measure the windows, mark their locations in the window opening and don’t forget to accommodate the 1/2″ spacer for the reinforcement bar between each window.

THROUGHOUT THIS MULTI-WINDOW INSTALLATION, CONTINUE TO MEASURE AND REMEASURE TO ENSURE ALL WINDOWS WILL FIT WITHIN THE OPENING WITH THE REINFORCEMENT MULL HARDWARE. 

Finally, the precision measuring and marking complete, you are ready to install the first window and secure to the framing.

Plan – Measure – Mark – Measure – Mark – Plan

Measure and Mark

Mark 1/2″ intervals for reinforcement mulls

Setting Window 1 into opening

Step 3 – Align, Set, Plumb, Secure, Measure

Window 1 is aligned with the markings made earlier. Align with the edge of the marking. Check for alignments and make sure any operable window will properly open. Secure Window 1 to the building frame. Measure again.

Line up Window to marking

Measure to make sure Window 2 will fit properly.

Secure window to framing.

Measure and place window properly

Step 4 – Install 1/2″ Reinforcement Metal Bar

The metal reinforcement bar(s) have been pre-cut to be used with the windows that were ordered. Remove the blue protective backing on the adhesive strip is removed on one side. Adhere the metal reinforcement to the open side of the already installed Window 1.

 

Remove Blue Protective backing from Metal Bar

Adhere Reinforcement Bar to Window 1

Secure Reinforcement Bar

Reinforcement Metal Bar

STEP 5 – INSTALL L-BRACKETS

Fasten the L-Bracket to the window through the reinforcement metal bar to the window and to the building frame. Two L-Brackets should be secured at the bottom and the top of the window.

Two L-Brackets for top and bottom of window

Attach Lower L-Bracker to window and house frame

Secure L-Bracket

Secure Upper L-Bracket to Window 1

INSTALL WINDOW TWO

STEP 6 – Installing Window 2

Once the L-Brackets are installed and measurements are assured, Window 2 is ready for placement and installation.

Remove blue protective strip on refo bar 

Install Window Two

Place Window Two

Measure for Window 3

STEP 7 – Install 1/2″ Reinforcement Mull Strips

After Window 2 is placed, Window 1 and Window 2 are connected together with the special trim, the 1/2″ mull strip. This 1/2″ mull is one of the proprietary installation trims available for purchase as part of the trim kit. Starting at the top, the mull strip connects the two windows together. Trim the bottom of the mull strip to fully connect the 1/2″ mull strip to the windows. Once the windows are connected together, secure window two to the building frame.

Attached 1/2″ mull strip to accessory pocket near top on both sides of window

Snap in half inch mull

Secure within the accessory pocket

Securing 1/2″ reinforcement mull into the accessory pocket

Step 8 -Trim and Secure 1/2″ Reinforcement Mull Strip, Secure Window

Outside bottom of Mull strip

Trim mull strip to be able to secure top to bottom within the accessory pocket between Window 1 and 2

Completed reinforcement mulling of Window 1 and Window 2

Secure Window 2 after completing mulling to Window 1

INSTALL ADDITIONAL WINDOWS, AS NEEDED

 

STEP 9 (FOR 2 WINDOW INSTALLATION)

If your reinforcement Mulling is for two window installation in one opening, your mulling is complete . Window trim-out (if required), and seal for replacement window installation is the final step to complete the installation.

STEP 9 (FOR 3 WINDOW INSTALLATION)

For more than two window windows in an opening, measure and check to be sure the remaining window (s) will be able to fit within the opening. Repeat Step 3 – 8 above.

WINDOW REINFORCEMENT MULL SUMMARY

Below is a brief pictorial summary of each step above (to complete out the 3 window installation in this case). After all of the windows are installed with the reinforcement mulls, complete the window installation. Replacement window installations may require additional insulation, installation accessory replacement windows trims and sealant. 

Ringer Windows offers full service window installations for replacement windows Austin area homes and businesses. Allow our in-house professional installation crews to provide superior service and knowledge for your replacement windows. Call today at 512-989-7000 to discuss Ringer Windows installation services for replacement windows.

 

 

STEP 3 – Plan/measure for next window

Step 5/6 If needed, Secure reinforcement bar, L-Brackets to open edge

Step 8: Secure Window to outer building frame

STEP 4 – Place and set next Window

Step 7/8 – Secure 1/2″ Mull Strip inside and out. Trim and complete

INSTALLATION OF THREE WINDOWS WITH REINFORCEMENT MULLS

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Ringer Windows
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Building 1, Suite 112
Austin, TX 78754

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