Roof Deck Drainage and Waterproofing

ARTICLE:  Roof Deck Drainage Problems. Waterproofing a 2 Ply SBS Modified Bitumen Roof Balcony in Edmonton, Alberta.

Recommendations for Waterproofing Outdoor Decks Over Conditioned Living Space. Roof Deck Drainage and Waterproofing - Inspection and Repair of a Torch-On Flat Roof on Outdoor Balcony at Multi-Family Condominium. Customers regularly call on us to have roof assessments (inspections) completed. During a roof assessment our journeyman roofers assess the roofs condition. We assess the roof for preventative maintenance reasons as well as inspecting existing problems that the customer is pointing out. We then discuss different scopes of work fix the problems as well as potential materials and costs related to the repairs. One of the most common calls we get for inspections and repairs are rooftop decks, balconies and patios. The primary reason the failure rate on rooftop decks is so high is because of the original installation. It is common for incorrect membrane choice to be the reason. In other words, many people install an outdoor deck membrane that is intended only for an outdoor deck and not a membrane for over a heated living space. If your rooftop deck or balcony is over a heated living area you require a special membrane that is also intended for low slope roofing (as well as deck waterproofing) and is approved for use over a conditioned living space. Common products for this are Dura-Deck or DecTec, both of which are a PVC membrane that are suitable to be walked on (so they do not require a floating deck over top) and they manufacture membranes suitable for over a conditioned living space. We use DecTec extensively and have had great results with it. Or, also common is the installation of a membrane that won't hold up to the foot traffic associated with outdoor living areas. Other reasons include simple age, wear and tear, drainage and issues relating to penetrations or floating deck assemblies on top of the membrane. Visit our main website for more information on rooftop deck waterproofing. This particular inspection and subsequent repairs was more focused toward an aging membrane and the associated repairs that come with not properly maintaining the deck membrane and building envelope over the years. The drainage problems were causing significant damage to the exterior of the building. Below you will find the inspection report. May 20, 2015: Journeyman Superintendent Attends for Balcony Inspection. Roof Inspection Location: 10245 116 Street NW Edmonton Alberta. Roof Inspection Date: May 20, 2015. Roof Type: SBS 2 Ply Modified Bitumen Torch-On Membrane on Roof Balcony. Site Location Type: Multi-Family Condominium.

This customer is experiencing a problem with water getting in the roof system and it draining out on a low corner and destroying some exterior brick work. In the area of the leak there are 2 laps of the SBS modified bitumen that have come apart.

Roof Deck Drainage damaging exterior of building. Edmonton, Alberta.
Roof Deck Drainage damaging exterior of building.
SBS Torch ON Seam Pealing back
SBS Torch-On lap pealing back.
SBS Torch on roof, seconf lap starting to come apart
SBS Torch on roof, second lap starting to come apart.
 

Scope: To repair this, degranulate the area and apply new torch-on stripping in and around the corner to seal in properly. Man hours: To complete 3 - 6. Material needed: 1 roll of SBS modified cap membrane.

The customer  would also like a quote for the following scope: to fill 13 pitch pockets on the roof and also seal the voids around pitch pockets with some detail sealer.

Area that needs sealing
Area that needs sealing at gutter to wall area.
Pitch Pockets that need filling
Pitch pockets at deck railing post termination area that need filling.
More seams on the sbs torch on roof that need to be sealed
More seams on the SBS torch-on roof that need to be sealed.

Man hours to complete = 10. Material needed: 4 gallons of portable sealer. 1 box of IKO MS Detail.

More Reading:
http://www.jlconline.com/decks/waterproofing-a-rooftop-deck.aspx
https://www.grscanadainc.com/Rooftop_Deck_Waterproofing.html
https://www.grscanadainc.com/DecTec_Deck_Waterproofing.html
http://www.dec-tec.com/
https://www.pinterest.com/generalroofing/dectec-deck-and-rooftop-waterproofing/
File to be updated when repair reports come in to office.
< End of report >
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Athabasca DecTec Balcony Assessment, February 2015

Our client, located north of Edmonton, reached out to GRS to explore the option of installing DecTec Membrane on a balcony off the second floor of their building. Scope of Work: 1) Removal and disposal of existing roof assembly under the existing membrane that would interfere with new surface installation. 2) Removal/replace rotten sheathing (if any). 3) Mild increase to slope to encourage drainage. 4) Door openings may have to be customized to account for new slope. 5) Flashing may have to be re-done to accommodate new slope as well. 6) Deck railing removed and replaced to ensure safety. 7) Waterproofing of walls to allow for vertical installations. Ensures watertight fit. 8) Upon completion of 1-7 (as necessary), floating deck can then be installed to support viable systems (SBS Modified Torch, EPDM, TPO, or PVC), though DecTec does not require a floating deck to sit atop the membrane.   Proposed Solution DecTec bore GRS's recommendation for this project, as we employ all of the technicians typically required to see a successful installation. The client was simply looking for a quote for this type of project, which we were happy to provide.   Existing Decking: Pre-DecTec Installation 1 Pre-DecTec Installation 2 Pre-DecTec Installation 3 Pre-DecTec Installation 4 Pre-DecTec Installation 5 Pre-DecTec Installation 6     Until next time,         The Roofers at GRS CODE: 4510 Contact Us Call our 24 hour emergency roof repair at 1.780.424.7663. Mail to: 3428 99 Street NW Edmonton, Alberta T6E-5X5. We service all of Alberta including Edmonton, Stony Plain, Spruce Grove, Fort Saskatchewan, St Albert, Sherwood Park, Leduc, Nisku, Beaumont, Lac La Biche, Grande Prairie, High Level, Westlock, Slave Lake, Edson, Drayton Valley, Devon, Camrose, Wetaskiwin, Tofield, Lamont, Morinville, Vegreville, Tofield, Millet, Calmar, Evansburg, Redwater, Onaway, Viking, Athabasca, High Prairie, Valleyview, Fairview, Peace River, Whitecourt, Mayerthorpe and many more rural areas and towns.  

Deck Membrane Replacement, April 2013, Edmonton

This residential client reached out to GRS to replace the membrane of their home's decking system. GRS ensured that everything was done to specification, in addition to some light repairs on the client's garage roof.   Quotation Delivered: February 26, 2013 GRS delivered a quotation for the membrane replacement on their existing deck that sits above a living area. The existing membrane would need to be removed and replaced with a new SBS system and some drains to accommodate the water ponding.   Client Correspondence: March 28, 2013 We sent word out to the client that the senior journeyman roofer would be attending the site this day around 5:00pm to go over the installation specifics. The journeyman was briefed ahead of time to understand that the scope of the work covered removing the existing membrane to the decking, then apply a 2-ply charcoal SBS Modified roofing system. If further work needs to be done to adjust slope or substrate repair; the journeyman will be able to assess the situation at that time.   Roof Report: April 8, 2013 A previous report (consisting of the membrane removal) is, unfortunately, no longer available. Work description: The crew arrived on site to continue with the deck surface replacement, so they started by removing the wood siding's first (bottom) row, and tarred the existing two layers of decking. The rest of the deck was the cleaned up and the gravel stop prepared for the new membrane. With that complete, they installed a layer of IKO Armourbond Flashing on the deck, including all corners and up the wall to 8" height.   image006image001 image002 image003 image004 image005         Roof Report: April 9, 2013 The garbage was all cleaned up, picked up, and disposed of before the crew got to the torch-on capping. As with all open-flame procedures, there was a fire watch protocol to carry out, so the team waited on-site for the prescribed time, working on sheet metal over the nearby garage in the meanwhile. Spots and laps were caulked to shore up the watertightness of the area.   Roof Report: April 11, 2013 The crew began by removing four old drains and replacing them with new ones. Shortly after, they moved to cut away the base sheet from the gravel stop and stripped it in correctly. Then, the cap sheet was cut and prepared for the following day. The crew had to seal up all of the exposed seams to waterproof it properly, before the cap sheeting could be applied.   20130411_114641 20130411_114656 20130411_163306 20130411_171017     Roof Report: April 12, 2013   This day, the crew used seven full rolls of SBS (black) cap sheeting and half of a roll of base sheet on the decking area. The four new drains were installed and the siding that had been removed some days earlier was replaced and installed into its original place.   Roof Report: April 13, 2013 All of the cap sheet was torched and installed to specification, and the site cleaned up of garbage. With the garbage disposed of, the project was now considered complete. 20130412_154320 20130412_154353     Warranty Repair Request: July 28, 2014   The client reached out to GRS to request an inspection on an area of the decking that was damaged during a patio door installation. Now, the deck appears to be leaking into the room below, and they would like it repaired. GRS booked a technician to go on-site the following day to see what needed to be dealt with.   Inspection: July 29, 2014 The technician went out to the client's location and began inspecting the decking area. There were some damaged spots, but (fortunately) none of them appeared to be a through-and-through puncture into the membrane. Upon visual inspection, the leak could be traced to a certain degree of accuracy, but the area underneath the new door is inaccessible without removing the doorframe around it. GRS delivered a new quotation for the repairs, and this report will be updated if/when work continues on this site.   Photos: Service Follow-up, October 21, 2015 Some additional photos were submitted to show how the canopy was holding up. They're embedded below. 20151021_112537 20151021_113656 20151021_120330 20151021_120544 20151021_120601 20151021_120606     CODE: 14107 Contact Us Call our 24 hour emergency roof repair at 1.780.424.7663. Mail to: 3428 99 Street NW Edmonton, Alberta T6E-5X5. We service all of Alberta including Edmonton, Stony Plain, Spruce Grove, Fort Saskatchewan, St Albert, Sherwood Park, Leduc, Nisku, Beaumont, Lac La Biche, Grande Prairie, High Level, Westlock, Slave Lake, Edson, Drayton Valley, Devon, Camrose, Wetaskiwin, Tofield, Lamont, Morinville, Vegreville, Millet, Calmar, Evansburg, Redwater, Onaway, Viking, Athabasca, High Prairie, Valleyview, Fairview, Peace River, Whitecourt, Mayerthorpe and many more rural areas and towns.