Gutter Hangers in Brick Mortar Are Where the Run Lets Go

If your gutters pull away from the house, the fastener is usually the first thing to look at, not the trough. Brick and block are common across St. Louis County, and a hanger driven into a mortar joint rarely stays where it was put. The gutter can look fine from the driveway until the next heavy rain shows a sag, a gap at a seam, or a pool of water under one downspout.

Why mortar is the wrong place for a hanger

Mortar is softer than the brick it holds together. Its strength depends on how well it was mixed, how old it is, and whether it has stayed dry. Many older houses in St. Louis were laid up with lime-rich mortar that crumbles with age, and even newer joints lose their bond when water gets in and freezes. A screw driven into a joint has far less to bite on than a screw driven into solid wood or a sound fascia board.

The freeze-thaw cycle is the main reason. Water soaks into the joint during a wet week, freezes overnight in January, expands, and loosens the material around it. Repeat that for several winters and the hole around the screw gets larger. Nothing about this shows up as a single event, which is why a gutter can look correct for years and then drop in one storm.

Hot summers add their own stress. Brick and mortar expand and contract at different rates, so the joint works back and forth every day for months. A hanger that was tight in April can have a hairline gap by the end of August, and that gap is where the next rain gets in.

What a hanger should bear into

A hanger needs to fasten into structure that is solid and well attached to the house. In practice that means a wood fascia board that is sound all the way to its nailing points, a rafter tail, or a masonry anchor set into solid brick or block rather than the joint between them. Where the fascia is thin, soft, or painted over a rot line, a new hanger will not hold either. The point here is simpler: the gutter is only as firm as the material that takes its load.

Ask the installer which material each hanger goes into. A good answer names the material and the fastener. A vague answer, such as saying they attach the hangers to the house, does not tell you whether a hanger is sitting in mortar.

How to check the hangers on your own house

You can do a basic check from the ground and from a stable ladder. Walk the run and look at the gutter line. Note any section that sits lower than the ones on either side, any seam that has opened, and any hanger with a gap between its bracket and the wall. Then, with a dry hand, gently pull outward on the gutter near each hanger. Movement at the hanger, a loose screw head, or powdery mortar around the fastener means the attachment is failing.

Look at the mortar joints directly under the gutter line too. Dark staining, sand-like material on the ground below, or a joint that breaks away under a fingernail points to water getting into the wall. Photograph anything you find before you touch it. The photos are useful for the contractor you call and for your own records, and they show exactly where the trouble sits.

What the repair usually involves

A proper repair does not just put a longer screw in the same hole. The usual options are a masonry anchor set into sound brick or block, a hanger attached to the fascia where the fascia is solid, or a relocated bracket where the original position was poor. Each choice depends on what the wall is made of and where the water is getting in. Sealing a loose hole with caulk alone rarely lasts through a St. Louis winter, because the material around the hole is still moving and still wet.

If a section of gutter has to be reset, the hanger spacing should match the rest of the run. Spacing is a separate question from the fastener, and it belongs in the quote itself, but the two decisions should be made together. A closer spacing does not help if each hanger pulls out of the mortar.

What to ask before you sign

• Which material does each hanger fasten into: wood fascia, rafter tail, masonry anchor, or mortar joint?
• If a hanger is set into mortar, what will be used instead, and why?
• Will loose or crumbling mortar be repaired or sealed, and who does that work?
• Does the quote list the fastener type and length for each bracket?
• Will the crew photograph each hanger attachment before the gutter goes back on?

These questions are simple, and a contractor who works in brick every week should have clear answers. If the answers are vague, ask for the job photo log before work starts, and ask for a written scope that names each attachment point.

When to call

Call sooner rather than later if you see a sagging run, a gap at the wall, or mortar on the ground under the gutter. Waiting a season lets water work further into the joint and gives the wall more time to move. Keys Roofing can look at the hangers, document each attachment point with photos and measurements, and put a written scope in your hands. You can reach the office at (314) 220-2333.