PW McCallum Roofing

roofing contractor located in beautiful Shawnigan Lake BC  

Synthetic Roofing VS Tar Paper

Synthetic Paper     When synthetic paper first came out, the sales rep told me this was the “best thing going.” Now, we are finding that in our west coast rain forest environment on Vancouver Island this is not totally true. First, I was told that it leaked if you didn’t use the plastic washer nails. After being told that, just a box of regular roofing nails was acceptable and if they were hand nailed, could be left to the environment for a year! Wow that’s incredible! But all good things must come to an end. Now we are finding that if the material is not cut back or if it is hanging down the typical 2”,  it will suck up water from the gutter i.e. “Wick”. We’ll also been told that some synthetic under-layment’s do not breath and cause moisture to be trapped on roof deck. We have found on two roofs in regular rainfall that the synthetics leak even with plastic washers used on an 8/12 pitch (that’s steep) and tarps had to be placed. We did however change brands and the problem was resolved but buyer beware. It angers us as we are professional roofing contractors the products were sold and promoted by our suppliers can be so faulty. I find myself over the years I have becoming very wary of new products. We have lost sales over this, however we feel it is worth losing the contract over putting on a roof that could be faulty.  

ROOFING PAPER     Today’s tar paper is nothing like the paper used in the 1970′s. Today tar paper is called number 15 and 30 paper and is made of recycled paper and a Tar mixture and fails rather quickly. Pre 1970′s, the tar or pitch was mixed with rag and felt fibers. This early form did stand up well. That being said if you’re willing to do some research when you purchase tar paper. New versions can be found that utilize polyester fibers, this product does perform well. Most often when a roof estimate is provided in the south island Victoria, B.C. and Duncan, B.C. the contractor is trying to be competitive. At PW McCallum Roofing we try to inform the customer, that best price is not always in best interest of the customer. We offer 7 generations in the industry as experience and 3 generations of that on Vancouver Island. We don’t always offer the newest trend on the market but will offer products with a proven track record.        

Posted 138 weeks ago


With spring just around the corner its time to start think about getting that leaking roof under control. At PW McCallum Roofing we offer fast same day roof estimates. We offer choice of the best asphalt roofing shingles. Brands like Owens Corning, IKO or Malarkey. If you have a flat roof we can also help with that as well, we have many great choices in flat roof membranes, like TPO or Torch on roofing. IF you’re done with replacing your every 20years we offer Metal Roofing be it pro-lock hidden fasteners for the home or office. Duraclad for the barn or shed we can help. One of our expert estimators with help you make an informed decision. We have the best roofers and they will takes the time to do the job wright. We are centrally located in beautiful Shawnigan, Lake we can serve you whether you’re in Victoria, Duncan, or Nanaimo we can be there in an hr. We also offer Roof repair for all types of roofs Asphalt Tiles, cedar shingles, Fat Roofing and Metal Roofing.  

Posted 140 weeks ago

Why should I have snow blocks? We often hear this when we install a new metal roofing in the Cowichan Valley and Victoria. Snow is very heavy and when it starts to slide it can quickly become very dangerous. If someone was standing under this it could result in injury or even death. Most often the gutters are ripped off, and damage is rather minimal. However I personally have seen sliding snow crush a sundeck into the ground, snapping large support posts like tooth picks. We didn’t have to look hard for some examples of the dangers around the Cowichan Valley. In the pictures you can see that the roof in question is on a drive up mall. Unsuspecting customers are parking right in the danger zone. In the small section in the picture that has broken free there is likely in excess of a 1,000 lbs 1 tonne sliding at free fall speed.

Posted 140 weeks ago
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Posted 140 weeks ago

PW McCallum Roofing Reviews

I decided to write an informative brog post regarding reviews true and false. Trolls are common on the web these days. It seems as soon as you get any sort of web presents, trolls show up. Problem with today’s review sites is anyone can write anything with no regard for the truth or anything resembling it. We do not respond to these people as it is the attention they seek. In some instances we have successfully sued these trolls for slander liable content. I’ve noticed we are not alone with this problem. If you’re coinciding a new roof read our real reviews or ask for a call list. We have a large list of happy recent and old customers that would be only too happy to tell you of their experience.

Believe me if you installed a roof that leaked and you didn’t repair replace it, people would take you too court not write a review.  If you are a troll reading this, we are a large company with a very good reputation that we will protect. We will come after you, so move along and do something good with your day. There are lots of charities that need help. I can provide you with a list of ones we support.  

Posted 142 weeks ago

Metal/ Steel Roofing

    Metal roofing is really buyer beware, what makes a good metal roof from a bad one is not easily seen. Level of quality changes geographically for instance a pro-lock metal roof installed in Victoria will be installed with a bottom starter flashing used and metal panel folded around it. In Duncan and the Cowichan Valley the bottom is almost never installed this way. We have found that though metal roofs are more common in the Cowichan Valley, this level of install is somewhat poorer quality than roofs installed in greater Victoria. Of course I’m sorry to say generally this applies to all roofing materials and their application in the Cowichan Valley. I’m not saying that every installer in the Duncan area is doing a poor install just that we have noticed poor installers do go unnoticed in the Cowichan Valley for longer periods of time. At PW McCallum Roofing our goal is to provide the best steel roof for a reasonable price and professionally installed.

    One of the biggest myths I hear when it comes to the purchase of a metal roof is question that the roof may be noisy in the rain. We feel that people come to this conclusion after staying in a trailer or something. However when roofing a house in metal there is an attic space in between that dampens the rain noise.  A modern home with an attic and a very thick layer of insolation, we don’t feel noise would be a problem when weighed against the overwhelming benefits of a metal roof. The benefits of a metal roofing are great. Long lifespan, increased asset value, many colors and styles plus the ability to safely harvest rain water for irrigation of plants. Please feel free to contact us with any questions about steel roof estimating and pricing.        

Posted 152 weeks ago

    Roof repairs in Duncan B.C.  The 2016 fall has been very moist and warm in the Cowichan Valley. Most of the leaks we have seen this year have been leaking chimneys and leaking skylights, we’ve had some flat roof leaks and a few metal roof leaks. @PW McCallum Roofing we now offer a yearly roof maintenance package that would make a great Christmas 2016 gift. The benefits that comes with a roof maintenance are many. Your roof is inspected for possible roof leaks, leaks that may go unnoticed for long periods of time are identified saving you thousands of dollars in damages from rotted moldy attics and walls.

     Call for a free re-roof estimate,  if your roof is beyond roof maintenance. We have many roof installation locations in Duncan, and Victoria, that can be viewed. We have many types of roofing products at these locations that we offer. Flat Roofs, TPO, Asphalt tiles and metal Roofs, for more go to our web page at        


Posted 154 weeks ago

Moss on my roof! Is it a problem? The answer is most often yes, moss roots itself into the granules i.e. rocks on asphalt roofing. The environment on Vancouver Island is optimum for the growth of moss and algae and molds.  On roofs that we have installed in Victoria and Duncan B.C. we have found the moss will start growing within 10 years on A.R. Roofs.)   A.R. Roofs are algae resistant roofs, some people refer to these shingles as moss proof. This however is untrue as there is over a thousand species of moss no manufacture can claim they can stop moss.  A.R. “resistant” please read more at

Posted 155 weeks ago


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Posted 191 weeks ago

Creepy ants might be living in your home

Posted 191 weeks ago

“The time to repair the roof is when the sun is shining.”


  Fall and winter 2015 is fast approaching and with that the Duncan rain and Victoria wind storms to go with it! It’s time to think about roof maintenance and roof leaks and how to avoid them. It is best when you have a roof leak to turn off power in that location. Via the breaker box if possible, or a wall switch at least. Roof leaks can lead to a house fire if they’re neglected Roof leaks enter the attic and soak your insolation. Under your insolation is a plastic vapor barrier that the water finds holes in.  The water most often surfaces around lights and fans.  This can lead to electrical shorts, and fires. . PW McCallum Roofing has roof repair experts to prevent and repair this. Roof leaks can travel in your attic a great distance before becoming visible in your home or office. Sometimes leaks can go unnoticed and cause molds and fungi growth leading to unpleasant smells and health effects.      .  

PW McCallum roofing understands roof maintenance.  Clearing the roof of leaves and twigs is a very important way to prevent leaks, also it is important to clear organic debris around vents and flashing to prevent water damming and entering your home. Wind can be very damaging on older roofs, after a wind storm you should inspect your roof for signs of wind damage. How wind damage to your roof may look, missing shingles or discolored spots on the roof. Should you have a roof leak or suspect roof problems. Whether you’re in Victoria, BC or Duncan, BC we have the roofing repair experts to help.  

Should you require a new roof or a roof replaced, we are your Roofing Contractor. PW McCallum Roofing offers free estimates we have fast friendly service in Victoria, BC and Duncan BC  We install TPO flat roofs, standing seam pro lock metal roofs, Asphalt fiberglass shingle Roofing and Recycled Rubber roofs, we offer green roofing options on our green roofing page    

Posted 215 weeks ago

Roofing Contractor Victoria Duncan BC PW McCallum Roofing

With fall weather coming, it brings back all the problems with that old roof that went away over summer. We find that fall brings clogged drains on your flat roof and gutters. Asphalt roofs suffer from clogged valleys and this can cause roof leaks. Our Roofing experts know this all too well, we offer preventative maintenance for your home, condo or business. One of our expert Roofers will come to you for a free estimate and recommend the best course of action be it new roof, roofing  repair or preventative roof maintenance, we can help!  We’re your local roofing company! We service Victoria, Nanaimo, Duncan, Mill Bay, Cobble Hill, and Lake Cowichan and all points between.   

Posted 266 weeks ago

top Questions asked when hiring a Roofing Contractor or Company

Roofing Project Questions and Answers


1. How long will it take to install my new roof? Answer: a number of factors come into play when installing a new roof.   An easy 1970s box house found in a number of older neighborhoods in Victoria, and Duncan, BC may only take a few days to re-roof. However a house that has wood shakes on it and requires plywood re-sheet may take up to a week, these houses are very common in the Victoria, Duncan, BC areas. It may take an extra day or so if your roof is complex with many small sections, such as; hips, valleys and steep pitches. Poor access can also be a time consuming challenge.  Weather is major factor; I say add a day for every day it rains.

2. What is the best time of year to do my roof? Answer: There is no real best time of year. Best temperature we feel is more important.  10°C to 14°C is best range.  The common belief is that summer is best; however this is not totally true.  Summer time the roofs are hot and shingles become soft from the heat, causing asphalt shingle to be easily damaged. Winter weather is a much bigger factor, as rain or snow could slow the roof job for a few days.

3. What does my estimate include? Answer: Most roofing contractors price roofs to be competitive, this however is not always best for the homeowner, because there are a number of benefits that may be overlooked at the time of the initial visit. We will inspect and bring to your attention, other possible problem areas and will include them in detail on your roof quote, as optional items.  Extra venting can be added, chimneys can be re-pointed/ repaired, skylights can be changed or installed, fascia boards can be replaced, Moldy/Mouldy sheeting can be removed and replaced with new making for a heather home.

Posted 307 weeks ago

New Roofs and Roof Repair in Victoria, and Duncan, BC

Fall is coming and in the Victoria, Duncan BC area’s and that means roofing leaks are back. We find this time of year to be very buzz y, the roof leak that you put off all summer in now wrecking your home. So book early and get the problem dealt with proactively, before you are scrambling to find a roofing contractor. While we are there we are only too happy to inspect your brick chimney and see if it needs pointing. We also inspect for mold in your attic, so have one of our expert Roofers go over your home. Remember roof estimates are free in Victoria, Duncan, Cobble hill, Mill Bay, Shawnigan Lake, BC and all point in between.  

Posted 323 weeks ago


We have found a number of mold problems in the Duncan, BC area. The cause seems to be a local roofing contractor is totally installing roofs wrong. I can see someone installing a roof so wrong on purpose, but I am stuck for a reason as to how this person gets work. The newer roof that we are replacing.  Starter shingles and the first coarse of shingles are not staggered.chimney metal total mess, it seems very common to find these problems in the Cowichan Valley 

Posted 324 weeks ago


The benefits to replacing your flat roof are amazing, TPO is very reflective, so on hot sunny days that we get here in Victoria, Duncan, BC in the summer time, it will keep your home or buz cooler. The large rolls mean less seems and that means less places to leak. We have installed a number of TPO roofs on Vancouver Island in locations such as Victoria, Duncan, Parksville, BC      

Posted 345 weeks ago
<p>TPO roofing, dead Valley Saanich BC also check out our new page </p>
<p><a href=""></a> for all your repair questions </p>

TPO roofing, dead Valley Saanich BC also check out our new page for all your repair questions 

Posted 345 weeks ago

Best time of year to install a new roof

Best time of year to install a new roof in Victoria, Duncan, Nanaimo, BC. Total myth we find that there is best time, In the summer the asphalt shingles can be damaged from walking on while roof is installed, however its less likely to rain while roof is installed. winter, spring and fall it may rain more often and roofing project might take longer to compete. The best over all conditions is sunny day with temps ranging 10 to 14 degrees centigrade


Posted 347 weeks ago

Moldy rv roof duncan bc PW McCallum Roofing

Your RV could have black mold in the walls, it may go unnoticed for years. If you live in a moist climate like in Victoria, BC on Vancouver Island Canada it could be very likely. A RV we just replaced the roof on, it didn’t smell of mold but when we removed the roof we found large amounts of mold inside the walls. Our web link here will explain the dangers of mold



Posted 348 weeks ago
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Black mold Duncan, Victoria, BC

We are happy to say we have added a new service to our business, Mold and mildews are a heath risk. We talked to our customers and weather they lived in Victoria, Millbay or Duncan BC the problem was the same. Mold in the attic from roof leaks needs to be addressed, both fixing the roof and removing the mold should be one service.  this is our new page    

Posted 348 weeks ago

Chimney Pointing

Most chimneys require re pointing every 20 years, mortar becomes what I call rotten, its becomes very soft and powdery. When your chimney is in this condition water can ever and may look like a roof leak.     

Posted 395 weeks ago

Green roofing page Updated

We have moved our attention to developing our green roofing in Victoria, Duncan, Cowichan Valley, page this is a link to new page\ 

Posted 395 weeks ago

OSB Board

Again we have come across a rotted out OSB board mess! It seems in a lot of cases the few hundred saved is only a short term game and a long term loss. Things such as improper venting or a small roof leak, are a death warrant for OSB board. The OSB turns black likely mould and the roof starts to cave in between the trusses. We have used plywood for this reason and the fact that OSB board off gasses formaldehyde.  Formaldehyde has been linked to increased risk of leukemia and brain cancer, We just cant install such a thing in your home just because of a bottom line, we hope that when you are getting your roof replaced, and you see one bid for less money make sure they are using plywood and not OSB Board  

Posted 396 weeks ago

built in gutters

I see a large number of my competitors, installing torch on in built in gutters. This is sad to see as torch on has no manufactures warranty if there is pooling water on the membrane, just by nature built in gutters always have some pooling water. I have seen torch on after 10 years with pooling water on it, it’s not nice. So you get a new 30 year fibreglass roof,  you install gutters that may last 12 to 15 years max 10 if there’s lots of water. I just wonder how well they sleep at night?    

Posted 397 weeks ago


wind is a huge enemy of older old interlock style (t-lock) roofs, its good to go out and look for wood or black spots on your roof if you have this type of asphalt roof. also if you can check flashing around chimney and skylights, if you have a flat roof, its good to have it inspected for damage from branches. a slow roof leak can do a lot of damage before getting noticed. for more info    

Posted 397 weeks ago


Moss should be killed as soon as it starts, its rapid growth its roots brake the water prof surface of the shingle, this allows water to enter into the shingle. We don't recommend removing the moss with force as this could result in a roof leak. Prevention is always the best method, moss is very subject to electrolysis. Like the hull of a boat, anything that changes the surface energy will kill moss, zinc stripping helps but is not a silver bullet and may not work at all the time . Treating the roof is the best method, zinc sulphate is the most effective and kills moss on contact, but the environmental consequence are huge, it can also eat the bottoms out of aluminium gutters. Laundry soap works but the sulphates can have a environmental impact. Both methods work, so if your going to use them please use moderation.                     

Posted 397 weeks ago

Roof Leaks

Roof leaks are not only bothersome, they can be very dangerous as the water can enter into wiring and cause fire!     

Posted 397 weeks ago


There are many green roofing products on the market today, EPDM rubber flat roofing is one or roof top gardens read more here

Posted 397 weeks ago
Posted 397 weeks ago

2116 Renfrew Rd Shawnigan Lake B.C. V0R 2W1

1724 Leighton Rd Victoria B.C. V8R 1M8

246 2 St Duncan B.C. V9L 1R6

309 Benhomer Drive Colwood B.C. V9C 2C7

246 2 St Duncan B.C. V9L 1R6