The Gutter Quote Should Name the Aluminum Thickness

Two seamless gutter quotes can both say "aluminum" while describing different products. One contractor may form the gutter from 0.027 inch coil. Another may use 0.032 inch coil. That difference is only five thousandths of an inch, but it affects how readily the gutter twists, dents and loses its shape. If the quote does not name the thickness, you cannot tell which material is included in the price.

The number is the nominal thickness of the aluminum before a machine forms it into a gutter profile. It is not the width of the gutter. A five inch gutter can be made from either thickness, and so can a six inch gutter. Color does not settle the question either. White, bronze and other finished coils can be available in more than one thickness.

For many St. Louis houses, 0.032 aluminum is the sensible specification for new seamless gutters. It provides a stiffer trough without changing the appearance of the house. That does not mean 0.027 material automatically fails, or that 0.032 material solves every drainage problem. Thickness cannot correct poor pitch, widely spaced hangers, a small outlet or a downspout that empties beside the foundation.

Gutters and guards

A gutter has to keep its cross section while water, wet leaves and occasional ice add weight. Once the front lip rolls outward or the back wall pulls away from the fascia, the trough no longer carries water as intended. A thicker aluminum wall offers more resistance to that movement.

Long, exposed runs deserve particular attention. A short gutter between two corners receives support from its shape and nearby fasteners. A forty foot run across the back of a house has more opportunity to flex. Wind can work at it. A ladder can strike it. A branch can land across it. Repeated freeze and thaw cycles can keep changing the load as water freezes, melts and freezes again.

Hail is a separate question. Both 0.027 and 0.032 aluminum can be dented by hail. The thicker material generally resists minor impacts better, but it is not dent proof. A sales proposal should not describe either thickness as protection against all hail damage. In the St. Louis area, where spring storms can bring hail and heavy rain together, drainage capacity and physical condition both matter after the storm passes.

The hangers may matter as much as the coil. Hidden hangers hook under the front lip and fasten through the back of the gutter into sound material. Their spacing should reflect the run, the attachment surface and the expected load. Thick aluminum with too few hangers can still sag. Closely spaced hangers fastened into soft or damaged fascia can still pull loose.

Ask where each fastener will land. A screw that only bites into a thin fascia covering is not the same as a screw secured into sound wood. If the fascia is deteriorated, covering it with new aluminum does not restore its holding strength. The repair needs to happen before the new gutter is loaded with water.

Gutter guards add another layer to the assembly. The guard type may fasten to the gutter lip, rest on hidden hangers, attach near the roof edge or use a combination of those points. That makes compatibility worth checking before either product is ordered.

A stiff gutter is helpful under a guard because the front lip is often part of the attachment. Yet the thicker coil does not make the guard maintenance free. Oak tassels, maple seeds, shingle granules and small leaves can collect on top of a screen or lodge near openings. Valleys can send water toward one concentrated section faster than a guard can admit it.

If you are buying a gutter and guard together, the written scope should identify both rather than treating the guard as an unnamed accessory. It should state the gutter size, aluminum thickness, guard type, hanger arrangement and downspout size. Those parts have to function as one drainage path.

What it costs

The thicker coil costs more, but material thickness is only one line inside the total. A gutter price also reflects the linear footage, number of corners, number and height of downspouts, removal of existing material, fascia repairs, access and guard installation. A simple one story rectangle is different from a two story house with several roof levels and enclosed courtyards.

Do not compare the bottom line until both contractors have described the same work. One quote may include 0.032 aluminum, larger downspouts and removal of the old gutter. Another may show a lower total without naming the coil, outlet size or disposal. Those are not yet competing prices for the same assembly.

Thickness is also a poor place to spend money if the drainage layout is wrong. Water must enter the gutter, reach an outlet and leave the house through a downspout and extension. A six inch trough made from 0.032 aluminum can still overflow if a steep upper roof concentrates water into a short lower section. It can still back up if the outlet is undersized or packed with debris.

There is no useful universal price difference to quote without measuring the house. Coil cost varies, and the labor required at the roof edge often exceeds the material difference. Ask for an alternate price if you want to see the actual change between 0.027 and 0.032 aluminum on your house. The alternate should keep every other part of the scope the same.

Repairs deserve the same clarity. If only one run is damaged, find out whether the existing gutter thickness and profile can be identified. A replacement section may look close while feeling noticeably different at a corner or end cap. Color also fades over time, so a new section may not be an exact visual match even if the original color name is known.

Permit requirements are not uniform across greater St. Louis. St. Louis County contains many municipalities with their own permit desks and adopted rules. Straight gutter replacement may be treated differently from work that includes structural fascia or roof edge reconstruction. The contractor should identify which local office applies to the address and whether the stated scope requires approval.

What to ask

Start with one direct question: "What aluminum thickness are you forming?" The answer should be a number in the written proposal, not merely "heavy duty" or "contractor grade." Those phrases do not identify a measurable product.

Then ask for the rest of the assembly in equally concrete terms:

• Is the gutter five inch or six inch?
• Is the aluminum 0.027 inch or 0.032 inch?
• What size are the downspouts and outlet openings?
• How will hanger spacing be determined?
• What material will the hanger screws enter?
• Are corners, end caps and downspout connections included?
• Will the existing gutters and debris be removed?
• How will water be carried away from the wall at ground level?
• If guards are included, what product and attachment method are specified?
• What happens if damaged fascia is found after removal?

Photographs can settle several of these questions before work begins. A useful gutter assessment shows the roof edge, fascia, existing fasteners, low areas, outlets, downspout route and the point where each downspout ends. On a house with several roof levels, it should also show where upper roof water enters the lower system.

Be cautious if the thickness changes only in conversation. The crew should receive the same specification that you approved. Put the coil thickness, gutter size, downspout size and guard product in the signed scope. If an alternate is accepted, the revised scope should replace the earlier description.

Call Keys Roofing at (314) 220-2333 to have the gutter runs, fascia, outlets and discharge points measured. Ask for the proposed aluminum thickness to be written beside the gutter size so you can compare the actual assemblies before deciding.