Question 1

Should I Worry About a Small Roof Leak That Only Happens Once a Year?

Accepted Answer

Yes. An intermittent leak is a real leak with a narrow trigger, and between appearances it soaks framing, insulation and decking where nobody can see it, so finding it now costs an inspection instead of a deck later.

Question 2

My brand-new roof is leaking. Should it be replaced or patched?

Accepted Answer

Find the source before deciding anything. Most leaks on a new roof trace back to one detail, such as a flashing, a pipe boot or a missed underlayment overlap, and are repaired locally; replacement is only justified when the fault runs across the whole roof.

Question 3

My flat roof leaks every winter and the roofer says that's normal. Is it?

Accepted Answer

No. A well-built flat roof should not leak in any season; a roof that leaks every winter has a defect, most often a blocked or badly sealed drain, an open seam, a failed flashing or ponding water, that has never been found and fixed.

Question 4

Roofer Did Not Tarp Properly and Water Got In — What Do You Do Now?

Accepted Answer

Get the water stopped first, then document everything before anything is cleaned up: photos of the failed tarp and the damage, written notice to the contractor, and a second roofer's written findings. That evidence is what insurance and liability questions turn on.

Question 5

How can I tell if my chimney flashing is failing?

Accepted Answer

Look at the joint where the chimney meets the roof. Rust or staining running down from it, cracked or pulled-away sealant, mastic or tape in place of metal, or damp around the chimney in the attic all mean water is already getting past it.

Question 6

Does a Cracking Shingle Roof in San Rafael Need Full Replacement, or Is It Repairable?

Accepted Answer

It is repairable when the damage is isolated to one or two places, such as a flashing, a slipped course or one penetration. It needs replacing when failures are spread across the field and earlier patches have stopped holding.

Question 7

The roofer says replace, the inspector says repair. Who do I believe?

Accepted Answer

Believe the one who can show you evidence: written findings, dated photos and the exact location of every problem. On a flat or low-slope roof the deciding fact is usually whether the insulation underneath is wet, which a moisture survey can show.

Question 8

Should You Replace Only the Worn Section of Your Roof, or the Whole Roof, in Berkeley?

Accepted Answer

Replace only the worn section when the rest of the roof is genuinely sound and the new section can be tied in cleanly at the edges. Replace the whole roof when the wear is spread across every slope.

Question 9

Bought a House With Multiple Shingle Layers — How Much of an Issue Is That?

Accepted Answer

It is not an emergency, but it is a decision to make on your terms rather than the weather's. Layers hide what is underneath, often old spaced plank sheathing, so plan for a full tear-off and a new deck when the roof is due.

Question 10

Is an Old Wood Shake Roof Worth Restoring, or Is It Time to Replace It?

Accepted Answer

Once shakes are splitting, lifting and rotting, replacing is usually better value than restoring. Cleaning and treatment help sound shakes, but they cannot fix an open valley or rotted boards underneath.

Question 11

Should We Paint Our Asphalt Shingle Roof White for Energy Savings in San Jose?

Accepted Answer

Usually not. Asphalt shingles are not made to be painted; paint can trap moisture, peel within a few seasons and put the warranty at risk, so the better route is cool roof shingles when the roof is due for replacement.

Question 12

Some of my roof tiles are cracked — does the whole roof need replacing?

Accepted Answer

Usually not. Concrete tile lasts decades, and cracked or slipped tiles are almost always a repair; what wears out first is the valley metal, flashings, underlayment at the edges and drainage around the tile.

Question 13

Our tile roof is covered in moss — am I in trouble?

Accepted Answer

Usually not in the way you fear. Moss on concrete tile almost never means the tile is finished, but it holds water and hides the underlayment, so the honest answer comes from lifting a few tiles.

Question 14

How Often Does a Tile Roof Need Maintenance, and How Long Does It Last?

Accepted Answer

Concrete and clay tile commonly lasts 50 years or more, but the underlayment under it typically lasts 20 to 30. Plan on a visual check every year or two, an inspection every three to five, and one underlayment replacement around year twenty-five.

Question 15

Should I Lift and Relay My Spanish Tile Roof?

Accepted Answer

If the tile is sound and the underlayment is at the end of its life, yes, and that is the usual situation on a Bay Area tile roof past about twenty-five years. A lift and relay replaces everything under the tile and puts the same tile back.

Question 16

On a lift and relay, should the new underlayment under tile be double felt or peel-and-stick?

Accepted Answer

For most Bay Area tile roofs, a high-temperature synthetic or self-adhered underlayment rated for tile is the better long-term choice. Use fully self-adhered membrane where water concentrates: valleys, eaves, walls, penetrations and low-slope sections.

Question 17

Leaking Tile Roof in Benicia: Can the Original Underlayment Last Another 10 Years?

Accepted Answer

Not where it is already leaking. Once water gets through, the lasting fix there is to lift the tile and replace the underlayment and battens; the rest of the roof can keep its original underlayment if an inspection shows it dry and intact.

Question 18

Can You Re-Lay Good Concrete Tiles Over New Underlayment in San Mateo, or Should They Be Replaced?

Accepted Answer

Yes. If the concrete tiles are sound, lifting them, rebuilding everything underneath and re-laying the same tiles is a legitimate reroof, and usually the better call when the tiles have outlived their underlayment.

Question 19

Is Replacing Our Concrete Tile Roof With Asphalt Shingles the Right Move?

Accepted Answer

For many Bay Area houses it is, provided the tile roof is due for new underlayment anyway and nobody is attached to the look of tile. Converting removes most of the weight on the rafters and replaces the whole waterproofing system in one job.

Question 20

What Are the Best Practices for Maintaining a Flat Roof to Prevent Leaks and Damage?

Accepted Answer

Inspect it twice a year, before the rainy season and in spring, and after any major storm. Keep drains and scuppers clear, look for standing water, check seams, flashings and penetrations, and fix small problems as soon as you find them.

Question 21

Does TPO on a Residential Flat Roof Really “End in Disaster”?

Accepted Answer

No, but the warning points at something real. TPO does not rot a deck; trapped moisture does, so a single-ply membrane over a wood deck needs the right insulation and vapour control in the assembly underneath it.

Question 22

Do I Need to Replace the Decking on My Flat Roof?

Accepted Answer

Not automatically. The decking only has to be replaced when it is no longer a sound, continuous surface for the new membrane, and that is decided once the old roof is stripped, not from the ground.

Question 23

Low-Slope Roof, and I Was Unaware of the Shingle Limitations — Am I Screwed?

Accepted Answer

Probably not, but you are on a clock: asphalt shingles are not rated below roughly a 2:12 pitch, so a shingled low-slope area leaks at the laps early. The fix is a continuous membrane on that one section, not a better shingle.

Question 24

Should a commercial flat roof be restored with a coating, or torn off completely?

Accepted Answer

Coat it only if the roof underneath is still sound and dry. Tear it off when the deck or insulation is already wet, because a coating seals that moisture in instead of removing it.

Question 25

Can you lay plywood over spaced planks when you reroof?

Accepted Answer

Yes, and on a roof built that way it is usually the only honest option. Spaced planks were made for wood shakes; asphalt shingles need continuous support, so the planks get overlaid with plywood.

Question 26

Can I Just Replace the Rotted Deck Board, or Does the Whole Section Have to Come Up?

Accepted Answer

It depends on what the rot is telling you. One soft board with solid decking around it is a patch; rot that repeats across the roof, or a deck that was never continuous, is a re-deck.

Question 27

The Roofer Did Not Put Vents in Our New Roof — Does It Matter?

Accepted Answer

Yes. Without intake at the eaves and exhaust near the ridge, the attic traps heat and moisture, shingles age faster, the deck stays damp in winter, and most manufacturers reduce or void the shingle warranty.

Question 28

Should You Replace Your Skylights When You Replace Your Roof in Pleasant Hill?

Accepted Answer

Usually yes, if they are near the end of their life. Replacing skylights during the reroof lets the new flashing be woven into the new shingles instead of cutting into a brand-new roof later.

Question 29

First Time Replacing a Roof: What Should You Know Before Talking to Roofers in Fremont?

Accepted Answer

Know four things: whether you are buying a full tear-off or a re-shingle, that soft plywood is replaced and billed as it is found, that ventilation and flashing get fixed at the same time, and that a permit and city inspection are part of a legitimate job.

Question 30

What Would a Roofer Say If You Offered to Tear Off the Old Shingles Yourself in El Sobrante?

Accepted Answer

Most roofers will say no, and not just for liability: tear-off is when the roofer sees the deck, and a roof is only as good as what it is fastened to.

Question 31

A home flipper didn't pull a permit for the roof on the house I bought. What do I do?

Accepted Answer

Start with the city: ask the building division to search the address for permit records and whether the work needed one. In Santa Clara, a re-roof generally needs a permit when new decking goes on or when larger dry-rot repairs replace decking.

Roofing Questions Bay Area Homeowners Ask, Answered by a Licensed Roofer

Leaks and water damage