Whenever real workable solutions are needed, count on TAMLYN to provide the answers. The XtremeBlockTM is made from predominately recycled materials in our continuing efforts to be good stewards of the environment. It has been uniquely designed to maximize moisture movement away from the envelope of the structure while offering a pleasing appearance. Lightweight, easy to install, primed - ready to paint or prefinished to match the siding color.

All the features of the insert block MB series are also provided in the one piece MP series. These are available in the 6x8 size with an electric box hole and in the 8x12 size with a 4" round hole.

How to order and specify the XtremeBlock



BASE CODE DESCRIPTION
MB812 8" x 12" with insert - all options up to max 4" hole
MB68 6" x 8" with insert - all options up to max 2" hole
MP68EB 6" x 8" with electric box cut - no options
MP8124R 8" x 12" with 4" round hole - no options
HOLE OPTION DESCRIPTION
1R 1" round hole centered
15R 1-1/2" round hole centered
4R 4" round hole centered
SM Split mount cut with 1" round hole
EB Single electric box cut centered
COLOR OPTIONS DESCRIPTION
XX Specify color using our standard code

MB Series Insert Mount Blocks


Solid Insert XtremeBlock


Frame material: High impact polystyrene
Frame wall thickness: .100"
Insert material: 1/2" closed cell cellular pvc

ITEM ID "A" "B" "C" INSERT TYPE
MB68 5-1/2" 7-1/2" 1-1/4" Solid Mount
MB812 8" 12" 1-1/4" Solid Mount

Split Mount XtremeBlock


Frame material: High impact polystyrene
Frame wall thickness: .100"
Insert material: 1/2" closed cell cellular pvc

ITEM ID "A" "B" "C" INSERT TYPE
MB68SM 5-1/2" 7-1/2" 1-1/4" Split Mount

Receptacle XtremeBlock


Frame material: High impact polystyrene
Frame wall thickness: .100"
Insert material: 1/2" closed cell cellular pvc

ITEM ID "A" "B" "C" INSERT TYPE
MB68EB 5-1/2" 7-1/2" 1-1/4" Receptacle Mount
MB812EB 8" 12" 1-1/4" Receptacle Mount

Round Hole XtremeBlock


Frame material: High impact polystyrene
Frame wall thickness: .100"
Insert material: 1/2" closed cell cellular pvc

ITEM ID "A" "B" "C" INSERT TYPE
MB681R 5-1/2" 7-1/2" 1-1/4" with 1" Hole (A/C or water lines)
MB8124R 8" 12" 1-1/4" with 4" Hole (Typical for dryer vents)

MP Series One Piece Mount Blocks


Receptacle XtremeBlock


Frame material: High impact polystyrene
Frame wall thickness: .100"
Insert material: .100"

ITEM ID "A" "B" "C" INSERT TYPE
MP68EB 5-1/2" 7-1/2" 1-1/4" Receptacle Mount

Round Hole XtremeBlock


Frame material: High impact polystyrene
Frame wall thickness: .100"
Insert material: .100"

ITEM ID "A" "B" "C" INSERT TYPE
MP8124R 8" 12" 1-1/4" Receptacle Mount

General Mounting Instructions


As with all exterior building components, XtremeBlock products must be installed in "shingle" fashion in accordance with the IRC section 703.1 (or local equivalent) to minimize water intrusion. Please ensure that each component of the installation overlaps the compnoent below. XtremeBlock helps you to meet the code requirements by providing a built-in flashing on the top of the component and an overlapping bottom drip edge.


STEP 1 : Center hole in XtremeBlock over the receptacle or pipe or hole in the wall. Fasten in place with 6 nails (12 ga x 1.5") or with 6 screws (#8 x 1.5"). Ensure that the bottom of the block overlaps the housewrap below the block as shown at left.


STEP 2 : Install the housewrap over the top flange of the XtremeBlock as shown. Keep the edges of the housewrap back 1/2" from the sides of the XtremeBlock to allow the flashing tape to stick on to both the housewrap and the side flanges of the XtremeBlock. If the housewrap is already installed before the installation of the XtremeBlock, slice a horizontal cut in line with the top of the XtremeBlock face and slide the XtremeBlock underneath the housewrap.


STEP 3 : Place flashing tape overside flanges of the XtremeBlock to seal the housewrap to the XtremeBlock side flanges. If you have had to slit the housewrap at the top of the XtremeBlock then you should also place a strip of flashing tape along the top flange of the XtremeBlock to seal the horizontal cut in the housewrap (not shown at left). DO NOT tape the bottom of the XtremeBlock to the housewrap as you would block the interior weep holes from functioning.


STEP 4 : Finish the installation by fitting the siding - plank or panel - around the perimeter of the XtremeBlock ensuring that the top cut is kept a minimum of 3/8" up from the top flange of the XtremeBlock. At the sides of the XtremeBlockTM the siding may be brought as close as is practical. Ensure that the siding portion below the XtremeBlock is behind the bottom drip flange of the XtremeBlock. Apply caulk down each side of the XtremeBlock between the siding and the XtremeBlock. DO NOT caulk along the bottom edges of the XtremeBlock.

ALONG WITH TAMLYN®

  • XtremeTrim®



    XtremeTrim® has thousands of design and color options, allowing architects and users to dramatically improve their building aesthetics and create modern architectural lines.

    Check our XtremeTrim® Profiles    
  • TamlynWrap®



    TamlynWrap® is the newest moisture management product from Tamlyn that effectively eliminates excess moisture and mitigates the damaging effects of mold and rot.

    Check our Water Management System    
  • XtremeBlock



    XtremeBlock has been uniquely designed to maximize moisture movement away from the envelope of the structure while offering a pleasing appearance.

    Check our Mounting Blocks    
  • ColorFlashing



    Available ready to paint, color match, and anodized finishes. Protects against leaks at walls and chimneys to roof connections.


    Check our ColorFlashing    
  • Ventilation Products



    Our ventilation products provides excellent airflow performance and a variety of appearance to suit different applications and use.


    Check our Ventilation Products    
  • Metal Products



    We manufacture joist and truss hangers, brick ties, hurricane clips, straps, and holdowns, as well as special and custom welded hangers.


    Check our Metal Products    

"Critical to the success of any design is the detailing and construction of it. We have been impressed with the Tamlyn Products for their complete system approach."

Brian Keith
Architect at JHP Architectural Designs, Dallas, TX

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