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Writer's pictureNikita Polkhovskii

4 Mistakes To Avoid When Measuring for a Stone Fireplace Surround

Are you a customer or professional in the world of home design and construction, seeking to elevate your projects with a stunning stone fireplace surround? The allure of a stone fireplace cannot be overstated, but before you embark on this exciting journey, it is crucial to ensure that your measurements are spot on. Here are five common mistakes to avoid when measuring for a stone fireplace surround.


1. Measuring To And From The Incorrect Points of Reference


One of the fundamental mistakes often made when measuring for a stone fireplace surround is not accurately identifying the correct points of reference. Precision is key in this process. Take the time to establish the exact points to and from which you will measure using the manufacturers specification guidelines. Keep in mind that your goal is to cover as much of the metal facing of the firebox unit (if non-masonry) while not encroaching on the fireplace opening or viewing area. Your attention to detail here will lay the foundation for a seamless installation, so do not include the size of the overall unit in your measurement, but strictly the opening. Consult the units specification pdf to see how much of a metal facing reveal is required, if any.


Masonry firebox measurements should be taken after firebrick installation, or the thickness of the mortar and firebrick must be accounted for. It is advisable to err on the side of a smaller opening rather than a larger one, as a slight 1/8" - 1/4" opening on a masonry unit like an Isokern will neatly conceal the exposed edge of the firebrick around the perimeter of the opening, as shown below.


A beautiful stone fireplace surround in limestone finish surrounded by two custom shelving units.
Royale Stone Fireplace Surround Masonry Firebox Measurement Reference

At times, a non-masonry unit may need to have a larger portion of its black metal facing left exposed. This might be necessary because of a glass cover that is installed over the opening, or because of the unit's design, which could feature a flange, vents, or sections that must remain uncovered according to the manufacturer's specifications. See an example below.

Beautiful White Cast Stone Fireplace Surround
Custom Stone Fireplace Surround With A Gas Firebox Unit & Glass Cover

In this case, your measurement would include the metal edgeing around the firebox opening area.


Alternatively, you might be able to cover the black edging of the firebox if no glass cover is to be installed. In this case, you would measure from the inner edge of each side of the firebox's inner perimeter, thereby excluding the metal facing. In this case the finished stonework will overlap the firebox, creating a clean finish as with masonry fireplace units. See example below.


A fireplace unit installed in a framed home that is under construction
Construction Stage Firebox Measurement Reference

2. Failing to Account Thickness of Floor When Measuring Firebox Offset


In the flurry of measurements and calculations, it is easy to fall into the trap of measuring from the wrong point. Whether you are working from the finished floor or the subfloor, this small detail can significantly impact the overall fit of the stone surround. Always double-check your measurements when measuring how high off the floor your firebox is installed. and ensure you are accounting for the thickness of the floor when installing a proud or raised hearth. If installing flush hearth, make sure to leave at least a 3/4" cavity in the finished floor if installing the stone hearth on non masonry subfloor, and at least 1 1/8" for masonry installation.


3. Not Checking the Manufacturer's Specifications


Manufacturers provide specifications for a reason – to ensure that their products are installed correctly and perform optimally. Neglecting to review the manufacturer's specifications for the stone fireplace surround you intend to use can lead to mistakes that are easily avoidable. Take the time to familiarize yourself with these guidelines and incorporate them into your measuring process for a successful outcome. While uncommon, some fireplace manufacturers have clearances to non-combustible materials that must be follow. Your contractor should work closely with your fireplace vendor to ensure the stone fireplace is totally compatible with your firebox of choice.


4. Failing to Consider Constraints


Every project comes with its unique set of constraints, whether it be spatial limitations, architectural features, or design preferences. Failing to consider these constraints during the measuring phase can result in costly rework and delays. Before taking any measurements, assess the space thoroughly, take note of any constraints, such as a gas switch, windows, or cabinetry on each side of the fireplace and adjust your measurements accordingly to ensure a flawless fit for the stone fireplace surround.


In conclusion, measuring for a stone fireplace surround requires careful attention to detail but is definitely achievable. By steering clear of these common errors and adhering to recommended methods, you can achieve a polished outcome that enhances the space's beauty and functionality. If you encounter any difficulties along the way, don't hesitate to contact one of our expert team members who will address all your queries and assist you with the measuring process. We are also ready to engage in a video call while you are on site, providing convenient guidance throughout the process. Remember, accuracy is key to creating a striking stone fireplace surround that will make a lasting impact.


A stone fireplace surround detail show with raised hearth and shelving situated in a living room
Ramford Stone Fireplace Surround with Raised Hearth





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