Resuming the Fireplace Build: Framing, Hidden Doors, and "Fireplace Math"

It has been three long months since I ripped out what I call the "monstrosity" that was my old fireplace wall. Life, as it often does, simply got in the way with summer projects and outdoor content, leaving this room tented off for a quarter of a year. I know my family—and certainly I—am tired of the enclosure and the wasted space. But I am finally back, and it’s time to tackle the framing and the hidden door.

The Secret Door Strategy

One of the most exciting parts of this build is the hidden panel door. This isn’t a standard door; it’s a flat panel that will eventually be disguised behind picture box molding. I’ve decided to use magnets for the closure, but the real trick is the floor clearance. To truly hide it, the door cannot be flush with the ground like a regular door, or the trim won't align. I’ve had to create a threshold to step over, allowing the trim to wrap around the bottom and keep the "secret" intact.

Tackling the Framing (and the Warped Wood)

Before I could get the door wall set, I had to even out the existing structure. I used some 1-inch thick scrap wood to pad out the framing because the previous concrete blocking left an uneven hang. I tacked these in with a finish nailer before coming back with the "big guns"—the framing nailer—to ensure everything was sturdy.

Of course, no project goes perfectly. Even though my lumber had been stored flat in a controlled environment, several pieces had warped and bowed significantly. To combat this, I’ve had to get creative: cutting around the warped sections to make smaller pieces, or using heavy weights and a little moisture to try to flatten them back out.

Tools and Safety

When things get intense, I always prioritize safety. I never start the saw without my Aleah Safety Glasses, which are tactical grade to keep my eyes protected while looking cute.

For the joinery, I’ve been using a combination of pocket holes and framing nails. I love using my Athena Cordless Power Drill for this. While I use a Kreg jig for the pocket holes, I still rely on nails for the main structure because, as the experts say, nails are often stronger in these builds; screws can strip or break, while nails have the flexibility to bend.

The Mental Battle and "Fireplace Math"

I’ll be honest: getting started again was a mental battle. Between the Florida rainy season turning the sky gloomy and the sheer scale of the job, motivation was hard to find. But I’ve learned that if you just take that first step and chisel away a little each day, you’ll eventually get there.

Once I got moving, I had to do some serious "fireplace math". My total workspace is 102.25 inches. To ensure the 34-inch fireplace insert stays perfectly centered, I decided to build the front wall in three separate sections. This prevents one side panel from being slightly larger than the other due to small measurement errors.

Seeing the Vision

After chiseling out some old thin-set mortar to get the base flush and dry-fitting the sections, I finally got to slide the insert into place. Seeing that unit sitting in the new frame made all the chaos of the last few months worth it. We aren't finished yet, but the vision is finally coming to life.

Ready to see the full transformation and every step of the framing process in action? Watch the full vlog on the Aleah DIY YouTube channel here!

Frequently Asked Questions

Why isn't the hidden door flush with the floor? 

If the door were flush like a standard door, the decorative trim (picture box molding) used to hide it wouldn't be able to run across the bottom, making the door's outline obvious.

2. How do you fix warped 2x3 or 2x4 lumber? 

You can try making the wood slightly damp and weighting it down with cinder blocks or gym weights. Alternatively, you can cut the straight sections out of a warped board to use for shorter support pieces.

3. Is it better to use nails or screws for fireplace framing? 

A combination is often best. While screws are great for pocket holes, nails are often preferred for framing because they are less likely to strip or snap under pressure; instead, they bend, which can make the structure more resilient.

4. How do you ensure the fireplace insert is perfectly centered? 

The best way is to build the side panels as identical units. By making both sides the same size and then framing the center opening for the insert, the fireplace will naturally stay dead-center.

5. What safety standards should I look for in DIY safety glasses? 

You should look for glasses that are ANSI Z87+ certified, which ensures they are tactical grade and capable of protecting your eyes from high-impact debris during construction.