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Drainable housewrap is a weather-resistive barrier (WRB) with a built-in drainage space that helps incidental water move behind exterior cladding and exit at the wall base. Before selecting or installing one, ask five questions: does its documentation match your code and assembly, will its drainage design work with the cladding, can it survive the planned exposure, how will openings and the base be flashed, and what fastening and accessory details does the manufacturer require? The right product is therefore conditional—not a universal “best wrap.” Use the current evaluation report, local code, wall design and installation guide together, then install the WRB and flashing as one continuous, outward-draining plane.
1. Does the product meet the code and have relevant performance documentation?
Start with the adopted code and the product’s current evaluation documents, not a marketing claim. Confirm that the drainable WRB is recognized for the wall type, cladding, climate and exposure planned for the project.
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Look for documentation addressing the properties that matter to your assembly:
| Check | Why it matters | What to verify |
|---|---|---|
| Code evaluation | A product can perform well in a laboratory yet be unlisted or limited for the use your jurisdiction permits. | Current evaluation report, listing scope and installation limitations; ask the building official which edition and report are accepted. |
| Drainage test method | “Drainable” is not a single performance class. | Test method, specimen assembly and reported drainage efficiency. ASTM E2273 is commonly cited for drainage testing. |
| Water and vapor properties | Bulk-water control and drying potential affect different failure modes. | Published water-resistance and vapor-transmission data for the exact product, not a similarly named model. |
| Assembly compatibility | The WRB is only one layer in a wall that may include sheathing, furring, a cavity, insulation and cladding. | Manufacturer details for your substrate and cladding, including required gaps, tapes, sealants and fasteners. |
An indexed discussion from Building Design + Construction suggests looking for at least 95% drainage efficiency when reviewing ASTM E2273 results. Treat that number as a selection criterion from that article—not as a universal code threshold. The applicable code, project specifications and current evaluation report control.
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Ask for the complete installation sheet and any addenda before approval. If a report covers only a particular cladding, substrate, fastener pattern or exposure, those limits follow the product to the job. A generic product data sheet is not a substitute for the report and details your inspector will rely on.
2. How will the wrap drain behind this cladding?
A drainable wrap creates a small capillary break or textured drainage path, but it does not automatically turn every wall into a rainscreen. Water still needs a continuous route from the back of the cladding to an exit at the base, and that route must remain open at corners, openings, shelves and changes in material.
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- Siding over sheathing: Confirm whether the wrap’s integrated texture supplies the required drainage space or whether the siding system calls for furring or a separate mat. Account for the texture when selecting siding fastener length.
- Stucco, adhered masonry or manufactured stone: These systems often have their own drainage-mat, lath and flashing requirements. Do not assume an integrated wrap replaces the cavity or layer specified for the cladding assembly.
- Brick veneer and other masonry veneers: Verify the air space, through-wall flashing and weeps required by the masonry design. The WRB must connect to those flashings, not terminate behind a blocked cavity.
- Panel systems: Check the panel manufacturer’s attachment and joint details; clips, rails and sealants can compress or bridge a drainage texture.
The U.S. Department of Energy’s Building America drainage-plane guide describes the WRB and flashing as a system. Its guidance is useful for understanding the principle, but the locally adopted code and the project’s cladding details still govern.
Product dimensions are specific. For example, the current Keene Driwall Drainable HouseWrap instructions identify a 1.5 mm drainage gap. That is a specification for that product, not a category-wide minimum. A different wrap may use another texture, gap or orientation, so never copy the dimension from one brand to another.
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Before ordering, draw a simple section through the wall: cladding, drainage space, WRB, sheathing, framing and interior layers. Mark where water enters, where it moves downward and where it exits. If any ledge, trim, flashing or sealant interrupts that path, resolve the detail before installation.
3. What are the wrap’s durability and exposure limits?
Choose durability for the actual construction sequence. Compare water resistance, vapor behavior, tear and fastener resistance, UV allowance and the maximum time the sheet may remain uncovered. There is no safe, generic “housewrap can stay exposed for X months” rule.
Use the manufacturer’s current limits for:
- UV exposure: Plan cladding so the WRB is covered within the stated period. If weather delays the job, protect the wall and ask the manufacturer whether an extension or replacement is required.
- Tears and punctures: Inspect every elevation after scaffolding, window work and siding installation. Repair damage with the specified tape, patch or liquid flashing; do not bury an unrepaired hole behind cladding.
- Wind and handling: Confirm the fastener type, cap size and spacing for the substrate and local wind design. A sheet that survives normal handling can still fail if the cap or spacing is wrong.
- Water and vapor: Compare published resistance and permeance with the complete wall’s drying strategy. A highly resistant layer may be appropriate in one assembly and problematic in another.
- Temperature and sealants: Check the application-temperature range for tapes and liquid flashing. Cold, wet or dusty substrates can prevent adhesion even when the membrane itself is suitable.
Schedule an inspection before the cladding conceals the WRB. Look for open seams, fishmouths, missing caps, unsealed penetrations and areas where the drainage texture has been crushed. Correcting these conditions is cheaper before siding, stucco or masonry is installed.
Do not transfer an exposure period, tape recommendation or repair method from another product. Even wraps that look alike can use different facer materials, adhesives and UV ratings.
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4. How do windows, doors, penetrations and the base drain?
Openings and the wall base are where a sound sheet installation most often loses continuity. Build the flashing sequence so each upper layer laps over the layer below and directs water to the exterior.
The Building America guidance on bottom-of-wall flashing emphasizes a positive path out of the wall. At windows, the indexed Building Design + Construction guidance points readers to ASTM E2112 for opening and flashing practice; use the current standard and the window manufacturer’s details for the specific unit.
- Prepare the substrate. Remove debris, flatten protrusions and replace damaged sheathing. Do not install over conditions the manufacturer identifies as unacceptable.
- Plan the base. Install the required kick-out, starter or through-wall flashing so water can leave the drainage space. Keep the WRB connected to this flashing, with no reverse lap.
- Install the lower courses. Start where the manufacturer directs, commonly at the base, and maintain the specified horizontal and vertical laps. The general water-shedding principle is bottom-up shingling: upper courses overlap lower courses.
- Integrate corners and transitions. Wrap or flash outside and inside corners, roof-wall intersections, band boards and changes in cladding before they are covered.
- Flash openings. Follow the selected window and door sequence exactly—some systems install sill and jamb flashing before the WRB, while others cut and fold the WRB around a prepared opening. Use the specified tape or liquid flashing and preserve a drainage path at the sill.
- Treat penetrations. Flash pipes, vents, electrical boxes, brackets and service lines with compatible boots, tape or liquid products. Sealant alone is not a substitute for a shingle-lapped flashing detail.
- Close and inspect. Tape or seal seams only as directed, repair cuts and confirm that the lower edge remains open to drain rather than sealed shut.
Product instructions can differ even on installation direction. Keene’s Driwall sheet directs installers to place its spacers toward the exterior and work from the bottom up. TYPAR’s product information states that its DrainableWrap fibers permit installation in any direction. Those are product-specific instructions, not competing universal rules; follow the wrap on the pallet and the current guide for that model.
5. Which fastening, seam and accessory details does the manufacturer require?
Fasteners, tapes and sealants are part of the drainage system. Select them as a coordinated package with the substrate and cladding rather than treating accessories as interchangeable.
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Confirm these details in writing before the crew starts:
- Fastener type and caps: Use the specified cap diameter, nail or staple type and spacing. Cap fasteners spread load and reduce the chance that a small head will pull through the sheet.
- Drainage-side orientation: Some wraps have a designated exterior face or spacer direction. A reversed sheet can flatten the drainage path or expose the wrong facer.
- Cladding fastener length: Add the wrap’s texture or mat thickness when sizing siding, trim or panel fasteners, while still meeting the required embedment in framing or sheathing.
- Seam treatment: Use only the tape, flashing or sealant listed for the membrane and the expected temperature and substrate. Check whether seams require pressure rolling, primer or a minimum overlap.
- Transition accessories: Confirm compatibility at window flanges, peel-and-stick membranes, metal flashings, masonry flashings and dissimilar materials. An adhesive that sticks to sheathing may not adhere to a textured facer or dusty masonry.
- Storage and handling: Keep rolls dry, protected from direct sun and supported so edges are not crushed before installation.
Make a one-page materials checklist that names the exact wrap model, compatible flashing products, cap fasteners, repair tape, liquid flashing, primers and cladding fasteners. Include the manufacturer’s detail-sheet revision and the date it was reviewed. This prevents a late substitution from silently changing the drainage or exposure performance.
What should be checked before the wall is closed?
Use this hold-point checklist with the installer, designer and inspector:
- Current local code, evaluation report and project specifications are on site.
- Substrate is sound, clean and dry enough for the selected adhesive products.
- Drainage direction and texture orientation match the exact wrap instructions.
- Bottom, corner, roof-wall and cladding-transition flashings are installed and open to drain.
- Window and door details follow the selected unit’s instructions and ASTM E2112 where applicable.
- All laps shed water outward; no upper sheet terminates behind a lower flashing.
- Penetrations, seams, tears and fastener locations are sealed or repaired with compatible products.
- Fastener caps and spacing match the wind and substrate requirements.
- Cladding fasteners provide the required embedment after accounting for the drainage texture.
- Exposure time is being tracked, and damaged or weathered areas are replaced before cladding.
If a detail cannot be found in the current guide, stop and obtain written clarification from the manufacturer or design professional. Do not improvise a window, base or roof-wall transition from a different wrap’s diagram.
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How should two drainable wraps be compared?
Score both products against the same assembly instead of choosing by a single drainage percentage or gap dimension. Compare code documentation, tested drainage performance, water resistance, vapor transmission, tear and UV durability, cladding compatibility, flashing and accessory requirements, labor sequence and availability of technical support. Then confirm that the preferred option is permitted by the jurisdiction and fits the project schedule.
A wrap with a larger advertised gap may still be the poorer choice if its flashing accessories are unavailable, its exposure limit conflicts with the construction calendar or its cladding details require a separate cavity. Conversely, an integrated texture can simplify a siding installation when the manufacturer and code accept it. The best selection is the one whose documented limits and details can be followed continuously from the roof-wall intersection to the wall base.
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Frequently Asked Questions
Is 95% drainage efficiency required by building code?
Not universally. The 95% figure is presented in a Building Design + Construction discussion as a useful criterion when reviewing ASTM E2273 results; the governing requirement is the code and evaluation report adopted for your jurisdiction and assembly.
Can a drainable housewrap replace a separate rainscreen?
Sometimes, but only when the code, cladding instructions and wall design accept the wrap’s integrated drainage space. Stucco, masonry veneers and some panel systems can require additional mats, furring or cavities, so verify the complete assembly rather than relying on the word “drainable.”
How long can drainable wrap remain exposed before siding is installed?
The permitted exposure period is product-specific and tied to its UV rating. Use the current manufacturer instructions, protect delayed work and replace or repair material that exceeds the stated limit or has weather damage.
What should I do if a window detail conflicts with the wrap instructions?
Pause installation and coordinate the window manufacturer’s detail, the WRB guide and the project’s flashing design. Resolve the sequence in writing before covering the opening; do not combine dimensions or tapes from unrelated systems.
