Monday, 16 February 2026
A technical inspection of San Antonio residential roofing reveals how minor installation shortcuts and improper valley geometry lead to major water damage during Texas rain events.
![Guadalupe Valley Services Roofing And Home Repair 2 GuadalupeValleyServices.com [FNvacc2WkcI] cover](/mikehansonarchives/media/assets/9ad381ec781a273bc9a66adeada6f293/images/artwork_large.webp)
Mike Hanson of Guadalupe Valley Services and Simon from Accent Roofing & Remodeling identify critical installation failures during a San Antonio roof inspection. The duo reveals how improper half-laced valley construction leads to catastrophic water intrusion in Central Texas homes. Simon demonstrates that placing smaller roof sections over larger ones forces heavy runoff beneath shingles, bypassing standard moisture barriers.
Manufacturers require shingles to be cut back two to three inches from the valley center to maintain clear drainage paths. Failure to adhere to these specifications results in organic debris accumulation and the formation of natural dams. Simon explains that sharp shingle points left in valleys catch twigs and leaves, creating mystery leaks during heavy rain events. These structural errors often persist through multiple repair attempts because the original geometry of the roof remains flawed. Mike Hanson provides free estimates for homeowners in San Antonio and Liberty Hill to address these specific technical oversights.
Simon shares his expertise as the owner of Accent Roofing & Remodeling while navigating the steep pitches of a residential property. The interaction highlights the collaborative partnership between regional experts Mike Hanson and Simon to solve complex drainage issues. This technical walkthrough serves as a warning for property owners dealing with persistent leaks that standard patching cannot fix.
Mike Hanson introduces a roofing inspection in San Antonio, Texas, representing Guadalupe Valley Services. He provides his contact information and introduces Simon, a roofing expert, to demonstrate common installation errors found on residential properties.
mike hanson· san antonio· guadalupe valley services· roofing· free estimate
Simon explains the technical failure of a half-laced valley where the smaller roof section was incorrectly placed under the larger section. This orientation allows heavy water runoff from the larger roof area to overwhelm the seam and flow underneath the shingles.
half-laced valley· roofing mistakes· water runoff· shingle installation· drainage
00:00 Hello folks, it's Mike Hanson again and I'm here in believe or not San Antonio. We're going to show you another really kind of a mistake that the roofer made on this roof and if you ever need any roofing You know we're in the business here Mike Hanson here Guadalupe Valley Services at 512-656-0521 And we're gonna talk to Simon He's the head roofer here and he is an expert on it. He's going to show you a common mistake. Okay Simon, go ahead! Actually, this valley has three mistakes in one valley and we haven't looked at the other valleys on the house. The first mistake is that this particular type of valley... Mike if you could shoot the valley? It's what they call a half-laced valley it's a style of working the valley where this section of roof is going up and across and under and this part's coming on top of it and then it's cut back That in and of itself is not wrong except that
00:57 This section should go across and this section should be cut back because if you pan the camera You'll see that. This is the bigger section of roof There's more water coming off this section than there is off this little section over here So when the water, this can overwhelm and run underneath this roof in a heavy rain. If this part went up and under it would just run off onto the roof they collide The force of this water collides with this force but this is overwhelming You always pick the bigger section to be the part that's cut back The smaller section overlaps the valley Mistake number one in this valley. The second mistake is that when you do cut the part that overlaps, the manufacturer wants it cut back out of the center so this one's lapped wrong and its actually cut past center they want 2 to 3 inches out of the center to get a clean flow of water That way you don't get all this debris that you see thats trapped underneath the valley here All that will wash clean if this valley was cut back Should have been laced the other way should have been cut back
Roofing manufacturers require shingles to be cut back two to three inches from the valley center to ensure a clean flow of water. Failure to maintain this gap leads to trapped debris and organic matter that prevents the valley from washing clean during rain events.
shingle cutting· valley center· debris buildup· manufacturer specifications· roof maintenance
Sharp shingle points left in a roof valley can catch twigs and leaves, creating a dam that causes leaks during heavy rain or "gully washers." These issues often result in mystery leaks that standard repairs fail to resolve because the original installation geometry remains incorrect.
shingle points· mystery leaks· damming· roof repair· gully washer
02:00 And the final error that they made was when you cut through these shingles Every once in a while you get a square edge like that naturally. Okay, and that's correct but when you get a point like this the manufacturers want those points nipped off or cut off because these points can catch twigs and leaves and make a dam there they can make a blockage that Can actually flood the valley it can cause a leak That will only happen when you get a really really big rain It'll be a mystery leak You know during a normal rain it won't happen Big rain, it'll leak and a lot of roofers don't even know how to fix that. You'll pay them to come out and do the repair And then you're out two or three hundred dollars and it doesn't leak for two or three years... ...and you get a gully washer! You get 3-4 inches of rain in 30 minutes and its leaking again! Then the guy's telling you while I fixed one spot, it's another spot or whatever excuse they have because the original roofer did it wrong and the guy who did the repair didn't know how to repair it
Mike Hanson concludes the inspection by offering free roofing estimates in San Antonio and the broader Central Texas region. He identifies Simon as the owner of Accent Roofing & Remodeling based in Liberty Hill, noting their collaborative partnership on regional roofing projects.
accent roofing· liberty hill· central texas· roofing estimates· simon
02:55 Obviously we know how to repair it or we wouldn't be explaining this in this fashion. Okay, this is Mike Hanson here and if you want to see me or Simon come out and do a free estimate on your roof give us a call on my cell phone We're actually in San Antonio We're out doing estimates here in San Antonio. So give us a call here at 512-656-0521, that's my cell number Guadalupe Valley Services and actually Simon has his own company Accent Roofing & Remodeling out of Liberty Hill Texas although we do work all over Central Texas and we work together too on projects
