How to Inspect and Caulk Flashing

June 3, 2021

Do you have flashing that is no longer sealed properly? You do NOT need to call in a roofer or other handyman to fix it. It's easy to do yourself. Read on for the step-by-step instructions for how to caulk flashing.

Thank you to DAP Products for sponsoring this post. As always, all opinions are 100% my own. This post contains some affiliate links for your convenience. Click here to read my full disclosure policy.

Y'all, this isn't the sexiest project ever, but it's important. So let's dive right into it!

What is flashing?

In case you are wondering why this is an important project, let's first talk about what flashing is. Flashing is usually made of aluminum and it is essentially what connects your roof to the your house at all the seams (where the roof meets the sides of your house, around dormers, around the chimney, etc). Flashing ensures that water runs off and down your roof instead of leaking into your house. It's a pretty big deal, but people rarely think about it.

How to inspect your flashing

We are lucky that we can inspect lots of the areas where our roof meets our house from our second-floor windows. You may have to get a ladder and climb up on your room (only do this if you are confident you can do it safely). You want to visually inspect your flashing around the base of your chimney, along the walls, around dormers and/or skylights if you have them and around any vents. You also want to look to make sure that holes made by roofing nails are sealed. If your flashing has lost its seal, you will see a slight gap between the flashing and the surface it is sitting against. This is what some of our failed areas looked like. See that gap?

failed seal along flashing

How to caulk your flashing

First, make sure you are using the correct product! We used DAP Crystal Clear Premium Gutter and Flashing Sealant. Another great option for sealing flashing is the brand new Ultra Clear Roof Waterproof Rubberized Sealant.

DAP 3.0 gutter and flashing sealant

Note that DAP Crystal Clear Premium Gutter and Flashing Sealant tends to be solvent clean-up, so you SHOULD wear gloves and eye protection when working with it. Do as I say, not as I do ;) You apply it like any other caulk. You don't have to make it look pretty — you just need to fully fill the gaps. One of the best things about DAP Crystal Clear Premium Gutter and Flashing Sealant is that it can be applied to wet or dry surfaces and is water-ready in 30 minutes. And thanks to its crystal clear color, it blends seamlessly with nearly all types of building materials.

how to caulk flashing

That's it y'all! This is a quick, easy and super important DIY. Have you ever done it? If not, I highly recommend you do it soon!!!!

+ show Comments

- Hide Comments

add a comment


the affordable alternative to an interior designer

Designer in a Binder®

learn more

Browse By Room

Looking for room inspiration? Or for posts about a particular space in one of our homes? This should help!

Living Spaces


Dining Room

Bonus Room


Laundry Room




Outdoor Spaces


Kids Rooms

oh la la!

Overwhelmed by picking paint colors?

You NEED this free guide!

In this guide, I reveal the simple trick to understanding paint chips so that you can pick the right color the first time!

Get Our Free Guide to Kicking Ass on Social

Taiyaki occupy farm-to-table swag fashion axe four loko. Church-key palo santo selvage helvetica iceland tumblr.




"Margi's guide was kick-ass indeed and quite literally changed how I show up on social." - Jen Olmstead

oh la la!

I'm Tasha! If you love...

more about me

hey there!

DIY projects
ignoring trends &
stretching your budget

then we were meant to be friends.