WindowWrap - How to Properly Flash a Window

hello I am David okoma product marketing manager with MFM building products today we are going to demonstrate M FM's recommended method of installing our window rap lines products window rap is a family of self adhered window and door flashing tapes manufactured by MF M we will use different window wrap products throughout this video welcome to the jobsite the house you see being constructed is by DCs companies located in Green Ohio Don Schultz owner of dcs is a custom builder of fine homes and this house is no exception let's get started doing all of the demonstrating today will be Paul Bratton MFM Technical Support Specialists this first window is actually added by the homeowner after the house was framed in-house wrap installed as you can see the Builder cut the house wrap flush on all four sides typically you would cut only the sill and header flush then wrap the jamb sections into the structure you should never wrap the header section of the house wrap into the structure if any moisture would get under the house wrap it would funnel directly inside the wall cabinet it is critical to follow this thing instead cut the header flush in as Paul's doing cut two 45-degree cuts in the house run fold this section of house rap out of the way and secure with staple you want to secure the header section of the window wrap directly to the wall sheathing now the rough window opening is ready to begin the flashing process you should always start by flashing the windows cell first before the window is installed to flash the sill Paul will be using window wrap flex a 70 mil polyethylene crepe film with an SBS adhesive system since this house was framed with 2x4 wall studs Paul is using a six inch wide membrane you want to cover the entire depth of the sill with the membrane and have enough to wrap onto the sheer wall if this house was framed using two by sixes you would use a nine inch wide membrane Paul starts by measuring the rough opening then adding six inches for each jamb section you want to extend the membrane up the sides of each jamb by at least six inches to create a waterproof barrier a good trick is to mark both the center section of the rough opening and the membrane to help make centering the membrane easier for this window Paul will remove the release liner from the entire membrane before laying into the silk Paul positions the membrane in place then start smoothing the membrane from the center out using hand pressure the biggest feature of window reflects is that the membrane stretches onto the shear wall there's no need to make any cuts in the membrane that might lead to a future leaf start in one corner and stretch the membrane with your hands out in over the house wrap smooth out any large wrinkles with your hands to eliminate large gaps in the membrane move to the other corner and repeat the process use your hands to smooth the rest of the membrane onto the wall then complete the job using a hand roller over the entire member now that the SIL is finished the Builder is going to install the window what is key to note here is that you should never flash the bottom of the window itself if the window would fail or moisture would get into this section you need to allow that moisture to drain out of the window flashing this would prevent that from happening this is a good time to point out that all of our window wrap products are self sealing this means that the membrane will see you around nails staples or other fasteners to prevent any moisture from infiltrating structure now with the window in place it's time to start flashing the to jamb sections on this window Paul will be using window wrap PS X 20 a 25 ml aluminized polymer film with an SBS adhesive system he starts by measuring each jamb section start approximately 4 inches above the top of the window and then measure just below or flush with the sill number do this on both sides of the window just to be sure it is always better to cut the membrane to length as opposed to trying to maneuver the whole roll here Paul removes just the top section of the release liner in positions the membrane in place moving slowly down the jamb pull the release liner and press the membrane into place as you go you want to make sure that you cover the nailing pin of the window now that the membrane is in place roll the entire section making sure there are no large air gaps never stretch or twist the membrane if you get off course or if you have a large gap it is better to just use a new piece of membrane on that section rather than trying to stretch the membrane repeat the same process on the other GM section always work deliberately to ensure the best seal possible as always finish by rolling the entire surface of the membrane to finish the window Paul measures the header section and adds approximately four to five inches on each side of the window to fully cover the to jamb sections once again it is important to note that the header membrane should be secured directly to the shear wall and over top the nailing flange of the window while secures the membrane in place and slowly removes the release liner as he works across the window smooth with your hand as you go once the membrane is completely in place roll the entire surface now that the header section is complete remove the staples holding up the house wrap and fold back over the window wrap member seal the two cuts in the house wrap with some extra pieces of window that completes the installation of this window again we use window wrap flex on the sill in window wrap PSX 20 on the jamb and header sections on the second window we want to show how to flash the cell using a straight flash product instead of window wrap flex as you can see there is no house wrap because this window is actually on the exterior wall of a closed in porch window wrap products work just as well here just as long as the substrate is clean and dry Paul will be using window wrap power bond it is also 25 mil membrane but uses a patented power bond adhesive system which aggressively adheres in temperatures as low as 25 degrees Fahrenheit when using a straight flash product there will be cuts in the cell membrane so Paul is using two small sections of window at power bond in the corners to prevent any infiltration of water these will end up being covered up place the small section into the window corner and stretch the membrane out and onto the shear wall repeat the same step in the other part now we follow the same process as we did with the window wrap flex measure the width of the window cell and at 6 inches for each jamb section here Paul aligns the membrane in place without removing the release liner start at one of the jamb sections and secure the membrane in place slowly work across the windowsill removing the release liner as you go smooth the membrane with your hand to avoid any large caps since this membrane is not designed to be stretched you must cut the membrane and fold it out and onto the shear wall using a sharp utility knife make a diagonal cut and wrap the jam section out and onto the shear wall move to the other corner and repeat the process now carefully fold the flashing tape onto the shear wall and smooth by hand as always roll the entire membrane making sure to achieve maximum contact with the substrate next we have the builder install the window per the manufacturer's specifications just like before Paul flashes the to jam sections carefully rolling each section after installing who finally Paul completes the header section if you are not getting the desired adhesion or if the temperatures below M FM's recommended installation temperature you can always use MF M spray adhesive that's it another window install and protected from any potential air or water leaks these window wrap products also prevent noise and insects from infiltrating the structure on this final window we are using window wrap flex power bond on the windowsill it has the same composition as wind over at flex but it utilizes the patented power bond adhesive system power bond is a two-part adhesive system which remains stable at elevated temperatures while adhering in colder temperatures it is a much more cost-effective solution than butyl adhesives on the jams in header section poles using our final window wrap product window wrap white this membrane is also 25 mils it has a white polymer phasor which is preferred by some builders it offers the same performance qualities of window wrap PSX 20 now that paul is wrapping up this final window we would like to thank dcs companies for allowing us to use their job site for our video to learn more about dcs please visit www.meliar.com/mpanel.htm these three products comply with almost 7-eleven national quality standards for window flashing tapes in addition these products also comply with the international code council's acceptance criteria for flexible flashing membranes which is ICC es AC 148 m FM's report number is IC si es es 2783 these product approvals ensure that when you install our window wrap products you can be assured that they will exceed your expectations for quality performance and value to learn more about MFM building products line of window flashing tapes please visit our website at MF MVP comm or by calling 888 two seven six six three to talk to a technical specialist

Channel: MFM Building Products Corp.

Views: 261,962

Keywords: window wrap, flashing windows, window flashing, how to flash a window, properly flash window, window tapes, self-stick window flashing, window wrap mfm, flexible flashing membranes, waterproofing, window waterproofing, how to waterproof a window, waterproofing windows, flashing membranes, self-stick membranes, self adhered waterproofing membrane, mfm window wrap, how to properly flash a window, window flashing installation, flexible window flashing, aama 711

Id: I5ooeVc39XY

Length: 12min 57sec (777 seconds)

Published: Tue Sep 20 2016