Window Rough Opening Prep And Flashing 19913776 (1)

in, Integrity or Infinity window product. Thesee construction using an industry approved waterplacement, and recessed openings refer to “ASTMmation for ASTM E2112 can be found on the ASTMe Barrier (WRB) is to be applied prior to windowsill pan flash detailed within is a TYPE III (flexible

2012-03-0719913776

Window Rough Opening Prep and FlashingMethod A1 - Membrane Drainage System

ABSTRACT: Please read these instructions in their entirety before beginning to install your Marvinstallation instructions demonstrate the proper rough opening preparation (RO prep) in new wood frammanagement system. For RO prep and installation using other construction methods, such as remodeling, reE2112-07, Standard Practice for Installation of Exterior Windows, Doors and Skylights,” for suggestions. Inforwebsite, www.astm.org. Method A1 applies to non-integral flanged and wood windows. Weather Resistivinstallation. Head and jamb flashing will be applied over the face of the non-integral mounting flange. The membrane).


Table of Contents rials Usedlowing materials were used to developstructions:

r Resistant Barriers (WRB): DuPont™ HomeWrap

g Material: DuPont™ FlexWrap NF®

g Materials: DuPont™ Flashing Tape

on: Dow™ Great Stuff Pro™ foamn, loose fill fiberglass insulation.

Foam should be minimal expanding, lowssion, closed cell foam and compliant with2112-07, sec. 5.9.2.

: OSI® Quad Pro-Series®; solvent butyl rubber sealant or DAPx230™.

Sealant must be compliant with ASTMrade NS Class 25.

aterials: DuPont™ Seam Seal Tape®, siding product, and various fastenersithin.

TANTmaterials may be used but must beible with one another. Refer to each's technical specifications for compatibilityge.

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Note to Installer ............................................... 2Trim Weather Resistive Barrier...................... 3Type III Sill Pan Flash...................................... 4Install the Window........................................... 5Flashing the Installation ................................. 6Insulating the Window Installation ................ 8

Note to InstallerConsideration of the window installation and wallas a system is important. The recommendedmethod in these instructions and referencedelsewhere are intended to do just that. Thesedetails follow the concept that stopping air flowinto the RO cavity will aid in managing waterintrusion. Striving to form a continuous air barrier,water drainage plane, an insulation barrier, and acontinuous vapor barrier is best practice; matchingthe window installation to the design of the actualwall system.

These details show a TYPE III flash pan (flexiblemembrane) and were based on ASTM E2112.This is one way to prep and flash a sill. Yoursituation may be different from those shown here.In that case we recommend that you referenceother details found in ASTM E2112.

The other three types are:

TYPE I: Rigid Sheet, 1 piece or multiple piece

TYPE II: Rigid Sheet, multiple pieces

TYPE IV: Combination rigid/flexiblemembrane (multiple pieces)

ATTENTIONPlan your rough opening carefully. The use ofpannings will affect the rough opening heightclearance.

Regional standard practices, environmentalconditions, and codes may vary andsupersede the procedures contained within.The responsibility for compliance is yours: theinstaller, inspector, and owner(s).

WARNINGWARNING

Always practice safety! Wear the appropriate eye,ear and hand protection, especially when workingwith power tools.

NOTE: Numbers listed in parentheses () aremetric equivalents in millimeters rounded to thenearest whole number.

MateThe folthese in

WeatheTyvek®

Pannin

Flashin(butyl)

Insulatiinsulatio

NOTE: compreASTM E

SealantreleaseDynaFle

NOTE: C920 G

Other Mbevelednoted w

IMPOROther compatproductand usa

You Will Need to SupplySafety glasses Hearing protectionLevel SquareHammer Sill pan flash Insulation Tape measurePerimeter sealantPlastic or composite shimsBacking material (foam backing rod)Flashing materialsWeather resistive barrier(WRB)

http://www.astm.org/Standards/E2112.htm






a continuous "Sill Wedge" out of cedarng or similar water resistant material tote a positive drainage slope. Glue to the

sill with two beads of sealant or adhesive screw in place. See figure 1c.

This will affect your RO height, plangly.

c)

Sill Wedge/Slope

Adhesive

32012-03-0719913776

Trim Weather Resistive Barrier (WRB)

Figure 1

1. Make horizontal cuts across the top andbottom of the RO.

2. Trim up from the bottom corners about 2″ (51)and then make an additional horizontal cutabout 3 1/2″ (89) wide.

3. Make a vertical cut down the center of the RO.Then make 45 degree cuts away from thecorners of the top of the RO. See figure 1b.

4. Flip top flap up and tack in place temporarily.Tack the side flaps away until sill flashing isinstalled. See figure 1b.

5. AddsidicreaROand

NOTE: accordin

(a) ((b) (c)


e plastic or composite shims at the ends in the middle of the RO to counter thee of the sill wedge and support the unit.ten with adhesive or finish nails. If usingh nails, place adhesive under shim where will penetrate. See figure 2e.

Seam Seal Tape

(e)

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Type III Sill Pan Flash

Figure 2 Type III Sill Pan Flash using a sill wedge and flexible membrane.

6. Apply self sealing flexible membrane to thesill. Attach to sill plate and wedge, out over theWRB and underneath the jamb flaps. Seefigure 2a.

NOTE: Some situations call for an upturned leg atthe interior. If that is the case, do so using theexcess sill flashing membrane to the interior.

7. Wrap side flaps to the interior and staple inplace about 1 1/2" from the interior edge of theopening. Cut the excess off near the staple sothat a 1-1 1/2" strip of bare wood is exposed.Tape this edge with seam seal tape. Seefigure 2b and d.

8. Apply seam seal tape over the corners and cutoff excess on the interior if applicable. Seefigure 2c and e.

9. PlacandslopFasfinisnail

Self Sealing FlexibleMembrane

Side jamb WRB wrapped to the interior

(a) (b) (c)

(d)

Side jamb WRBcut off half way into RO

Sill Wedge/Slope


in from the end. Apply sealant down both

lastic shims may be necessary to counter

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Install the Window

Figure 3 Install the window per installation instructions sent with the unit.

1. Starting in 3/4″ from the side, apply 1/4″ to 3/8″ bead of sealant 1/2″-3/4″ across the top of the RO stopping 3/4″sides of the window opening in the same manner. Do not apply sealant across the RO bottom. See figure 3.

2. Place a bead of sealant ¼-3/8" from interior edge of the RO sill.

3. Install the window according to the Marvin installation instructions provided with the product. Use of composite/pthe slope and level unit or lift above selected panning method as well as provide support.

Sealant

Sealant

http://www.marvin.com/windows-and-doors/installation-instructions/


ures are identical for windows with casing

Follow the flashing manufacturers’ended instructions for attaching to the materials under the WRB. For example, wet or frozen wood, applicationture, etc

all a "Skirt." Use flashing material or a strip of WRB and attach to the sill of thedow with seam seal tape or flashing tape.

ilingl (on

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Flashing the InstallationNOTE: Some illustrations and text in this section refer to units built without brick mould casing or flat casing. Procedunless noted.

Figure 4 Flashing the installation.

IMPORTANTNailing fin is not designed to be a weatherproofflashing.

1. On clad units, apply nailing fin corner gasketsto each corner of the nailing fin. Followinstructions on back of gasket. (Wood unitsand units with clad casing do not usecorner gaskets.) See figure 4a.

NOTE: If a drip cap is not already installed on thehead jamb or head jamb casing of the window, doso now. The drip cap should extend about 1/8″ (3)beyond the edge of the window on each side. Besure to apply a bead of sealant along the backsides of both vertical and horizontal surfaces ofthe cap that come in contact with the window,window casing, and sheathing. See figure 4b.

NOTE: recommbuildingprimingtempera

2. Inst12"win

Drip cap

Corner gasket

Install skirt over sill nafin or butt up to subsilwood units).

(a)

(c) (d)

(b)

Install drip cap on woodunits and units with casing.


es of the flashing from curling up over. See figure 5c.

head jamb air barrier down over the headb flashing. Apply seam seal tape over theonal cut in air barrier. Make sure the tape onto the unit or casing. Tape and seal anyms and fasteners directly above the unit. figure 5e

(d)

(e)

Use flexiblemembrane athead jambs ofround topunits.

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Flashing the Installation (continued)

Figure 5

3. Lap vertical strips of self sealing adhesivemembrane onto the unit or casing and outover the air barrier. Make small cuts at thehead jamb to allow the membrane to fold backonto the exterior. See figure 5a.

NOTE: On Round Top units flash the head jambusing a flexible membrane. See figure 5d.

4. Install another layer of adhesive membranelapping onto head jamb of unit and oversheathing. Membrane flashing at head jambshould extend and cover flashing membranepreviously installed at jambs. See figure 5b.

5. Tape the top edge of the head jamb flashingwith seam seal tape. This will help to avoid the

edgtime

6. FoldjamdiaglapsseaSee

Cut flashing athead jamb andfold back ontounit.

(a) (c)

Fold WRBdown overhead jamb

(b)


ing air intrusion will aid in managing waterell foam at the exterior plane of the RO inhe exterior plane of the RO and another at

en the low expansion foam has set, fill theity with loose fill fiberglass insulation. Seere 6c.

l Loose fill fiberglassinsulation

(c)

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Insulating the Window InstallationNOTE: We recommend two possible ways of insulating the RO cavity. Both methods follow the principle that stoppintrusion into the RO. The first method uses a combination of one bead of low expansion/low compression/closed cconjunction with loose fill fiberglass insulation. The second method uses two beads of low expansion foam (one at tthe interior plane of the RO).

Figure 6 Insulating the RO using a combination of minimal expansion foam and loose fill insulation (Method 1)

Insulating the RO (Method 1)1. Insert backer rod around jambs and head

jamb. Push backer rod to the back of thecavity so it contacts casing or nail fin (or in thecase where neither are used, exterior flashingmaterial). See figure 6a.

2. Apply one bead of minimal expansion, lowcompression, closed cell foam against thebacker rod. See figure 6b.

3. Fill the bottom corners with foam out to the sillsealant line. See figure 6b.

4. Whcavfigu

Minimal expansion foam-filled behind backer rod andat the corners over the silsealant line

Backer Rod

(a) (b)


ly a second continuous bead of foam atinterior plane of the RO around the jambs head jamb. This bead should contact theealant plane. See figure 7c.

e foam has cured, trim excess as needed.

(c)

Second bead offoam on the interioredge of RO.

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Insulating and Sealing the Window Installation (continued)

Figure 7 Insulating the RO using two beads of minimal expansion foam (Method 2).

Insulating the RO (Method 2)1. Insert backer rod around jambs and head

jamb. Push backer rod to the back of thecavity so it contacts casing or nail fin (or in thecase where neither are used, exterior flashingmaterial). See figure 7a.

2. Apply one continuous bead of low expansion,low compression, closed cell foam against thebacker rod. See figure 7b.

3. Appthe andsill s

4. Onc

(a) (b)

Minimal expansionfoam against backerrod.

Backer Rod

Window Rough Opening Prep And Flashing 19913776 (1)

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