self-adhesive roof membranes best practices, common problems, and other sticky information from the manufacturer s pe

1. 10-29-2009 Self-Adhesive Roof Membranes

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3. 10-29-2009 Self-Adhesive Roof Membranes Characteristics common to all SA membranes Self-Adhesive: not self-adhering We�ve yet to see a roll adhere itself to anything Should be termed PSA (pressure sensitive adhesive) membranes Pressure must be applied to ensure complete and watertight bonds

4. 10-29-2009 Self-Adhesive Roof Membranes Characteristics common to all SA membranes Self-Adhesive: not self-adhering We�ve yet to see a roll adhere itself to anything Should be termed PSA (pressure sensitive adhesive) membranes Pressure must be applied to ensure complete and watertight bonds Requires some finesse compared with traditional application methods These aren�t your father�s hot mot mopped or welded systems

5. 10-29-2009 WHY Self-Adhesive Membranes? Advantages no adhesive to apply � no buckets to dispose of no open �dry� time & less set-up time reduced solvents/fumes & no hot asphalt consistent/uniform application of adhesive techniques aren�t radically different details familiar � either the same or very similar crew size may be reduced speedy application

6. 10-29-2009 WHERE Do Self-Adhesive Membranes Make Sense? Where open flames are not allowed Where solvent or asphalt fumes may be an issue Where you can�t set-up for hot asphalt, but want an asphaltic system

7. 10-29-2009 WHERE Do Self-Adhesive Membranes Make Sense? Where a mechanically attached system won�t work � you can�t penetrate the deck When you have a weight limitation

8. 10-29-2009 WHEN are Self-Adhesive Membranes NOT a Good Idea? Ponding water, anyone? Steep slope, no ability to fasten Cold (or cool) weather? Dirty, messy tear-off � can�t quarantine or separate the roofing application

9. 10-29-2009 Some General Considerations� Be sure to store properly� out of direct sunlight Do not use if membrane is not tacky to the touch (SA has a shelf life) Be sure to have adequate slope and drainage Don�t interfere with ventilation needs of the building� they can form a vapor barrier

10. 10-29-2009 Additional Considerations� Substrate must be: clean dry free of dust, dirt, oils, etc� may need priming Perform a �tape test� with masking tape to confirm substrate�s condition

11. 10-29-2009 Additional Considerations� Without liquid bitumen (hot asphalt, torch, bonding or cold adhesive) to fill surface irregularities� it is critical to pay attention to laps and t-joints SA sheets are pressure sensitive and should be treated as such.

12. 10-29-2009 Additional Considerations� Be sure to follow mfr�s temperature recommendations� cool weather will affect how well they adhere At temperatures below 50oF special precautions should be followed � especially if there is no sun The ambient temperature, substrate temperature, and membrane temperature must all be considered. Artificial heating, e.g., hot air may be employed to ensure adhesion at low temperature

13. 10-29-2009 What Types of Products Are Available? Asphaltic membranes Steep-slope ice damming membranes Low Slope Systems Single ply membranes TPO

14. 10-29-2009 Self-Adhesive + Low Slope Combines the historical performance of modified bitumen compounds with addition of a self-adhesive layer for ease of application, however�..

15. 10-29-2009 Self-Adhesive + Low Slope There are basic differences between steep and low slope applications. Steep slope products are typically used as underlayment, and function as secondary moisture protection Low slope products must be waterproof when they are installed

16. 10-29-2009 Specifically for Asphaltic Membranes Base/inter plies� self-adhesive w/release film or paper various surfacing options (sand, film, SA, �.) some are suitable for mechanical attachment reinforced with either fiberglass, polyester, or a combination of the two Cap sheets� self-adhesive w/release film or paper typically granule surfaced or other opaque surfacing reinforced with either fiberglass, polyester, or a combination of the two

17. 10-29-2009 Self-Adhesive Roof System Main Point: Take a look at the MA (Mechanically Attached) liberty system. What to say: Cold Applied system breakdown- this is over a wood deck. May want to make note you eliminate torches and kettles over wood decks! Remember with an MA base you don�t need to prime the plywood. This diagram shows a 3 ply liberty system. MA base sheet, SA (self adhered) interply and a granular cap sheet. Slide Summary: The mechanically attached Liberty system is great in areas where you may need to remove the membrane at a later date. Main Point: Take a look at the MA (Mechanically Attached) liberty system. What to say: Cold Applied system breakdown- this is over a wood deck. May want to make note you eliminate torches and kettles over wood decks! Remember with an MA base you don�t need to prime the plywood. This diagram shows a 3 ply liberty system. MA base sheet, SA (self adhered) interply and a granular cap sheet. Slide Summary: The mechanically attached Liberty system is great in areas where you may need to remove the membrane at a later date.

18. 10-29-2009 SA base plies with heat welded (HW) cap sheets offer added protection for torch applications. Combustible materials and hidden areas of negative air pressure are covered by the SA material. See CERTA guidelines. SA base plies with heat welded cap sheets also extend the application window for SA sheets in cool conditions.

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21. 10-29-2009 Self-Adhesive TPO Membranes Using traditional smooth back membranes as the backbone�45, 60, 80 mil It�s the same sheet that provides the waterproofing and weathering layer

22. 10-29-2009 Self-Adhesive TPO Membranes? What Stays the Same? Everything� plus adhesive� Reflectivity � it�s still Energy Star�, meets Title 24 Puncture resistance Tear resistance Cold flex Breaking strength/elongation at break Dimensional stability

23. 10-29-2009 TOP 10 LIST� Helene and Tim�s Top 10 List (well almost 10) What NOT To Do!

24. 10-29-2009 Avoid� Improper Insulation Attachment Fasteners not set properly, backing out Dirt and Debris on Substrate Affects ability to adhere Moisture on Substrate (even morning dew� or that light mist on a foggy morning) Affects ability to adhere Low Temperatures During Installation (just because there wasn�t ice on the rolls�) Requires warming rolls, tacky primers, or heating if necessary Misalignment of Sheet Can �short� the lap width � especially with membranes that don�t have a granule selvedge

25. 10-29-2009 Not Properly Rolling In the Membrane/Using Wrong Roller (or none� ewww) Can affect adhesion to the substrate Mis-Identifying T-Joint Locations Use of a 45 degree cut greatly reduces problem Improper Wall Flashing Heights Both too low and too high� follow mfr�s recommendations Absence of Primer Critical to adhesion, especially on walls and membrane Avoid�

26. 10-29-2009 Where Should Care Be Taken? What are acceptable substrates? How should the lap area be cleaned? What about priming of the laps? Weather conditions� >45 or 50�F typically.

27. 10-29-2009 Where Should Care Be Taken? Placement of the membrane if heat weldable grade�make sure the lap is placed correctly Self-adhering laps may be larger� can reduce area covered by ~5% Is cut edge sealant recommended? What about sealant along the underside side laps? How should endlaps be made?

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29. 10-29-2009 Where Should Care Be Taken? Remember, repositioning of the membrane is difficult at best � impossible at worst� check sheet position before removing release film Sheet to sheet adhesion� cut out & replace (you want this stuff to be sticky) Keep paper, debris, release film, dirt, etc. from getting into the system Follow mfr�s recommendations regarding rolling of membrane/laps

30. 10-29-2009 And You Were Wondering� Where�s the Data?

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33. 10-29-2009 For TPO, Same Story, Different Day� About cleaning on self-adhering laps�

34. 10-29-2009 In Summary � Consider System Advantages� No (or min. amount) adhesive to apply Always correct, consistent/uniform application of adhesive No buckets to dispose of Less staging area No open �dry� time or �set-up� time No need to wait for solvent to flash off

35. 10-29-2009 In Summary � Consider System Advantages� Reduced solvents/fumes & no hot asphalt Less use of solvent based adhesives Techniques aren�t radically different Details familiar Either the same or very similar Speedy application Crew size may be reduced

36. 10-29-2009 In Summary � Don�t Forget System Limitations� Increased Material Cost Adhesive cost is �built in� from the factory Positive Drainage Required For completely self-adhered systems Ambient Temperatures Cold weather is bad, 45-50 degrees and rising Reduced Coverage ? Products with larger lap area reduce coverage

37. 10-29-2009 Thank You For Your Time And Consideration!