Exhibit 99.1

INSTALLED BUILDING PRODUCTS REPORTS RECORD RESULTS

FOR FOURTH QUARTER AND FISCAL YEAR 2020

– Annual Revenue Increased 9.4% to a Record $1.65 Billion

– Annual EPS Increased 43.4% to a Record $3.27 Per Diluted Share

– Annual Cash Flow from Operations Increased 46.9% to a Record $180.8 Million

– Completed 9 Acquisitions Representing Over $107 Million of Annual Revenues

Columbus, Ohio, February 24, 2021 Installed Building Products, Inc. (the “Company” or “IBP”) (NYSE:IBP), an industry-leading installer of insulation and complementary building products, today announced record results for the fourth quarter and fiscal year ended December 31, 2020.

Fourth Quarter 2020 Highlights (Comparisons are to Prior Year Period)

Recent Developments in Press Release Issued February 23, 2021

“Our record 2020 financial results demonstrate the hard work, dedication, and commitment of our nearly 9,000 team members nationwide,” stated Jeff Edwards, Chairman and Chief Executive Officer. “Throughout 2020, we maintained our commitment to quality and dedication to providing our customers unparalleled service, while protecting the health, safety, and well-being of our employees, customers, partners, and communities.”

“As we successfully navigate the unprecedented challenges associated with the COVID-19 pandemic, we remain focused on pursuing our ongoing geographic, end-market, and end-product diversification strategies. In 2020, we completed 9 acquisitions representing over $107 million of annual revenues, which reflects continued expansion in our primary residential end markets and included acquisitions in the large

1

commercial construction end market. We also experienced same branch sales growth across all of our end markets in 2020, led by multifamily same branch sales growth of 22%.”

“We believe most of our markets will remain strong in 2021 and we expect 2021 will be another good year of growth and profitability for IBP, despite the continued effects of the COVID-19 pandemic. Reflecting our confidence in executing on our acquisition strategy and our commitment to create long-term value for shareholders, I am pleased with the Board’s decision to initiate a quarterly cash dividend program, and increase and extend our share repurchase program. The financial and operating accomplishments we achieved in 2020 is encouraging and I remain excited by the continued opportunities to grow IBP and create even greater value for our shareholders,” concluded Mr. Edwards.

Acquisition Update

We continue to prioritize profitable growth through our proven strategy of acquiring well-run installers of insulation and complementary building products, and during 2020, IBP completed 9 acquisitions representing over $107 million of annual revenues. Our acquisition strategy is supported by our solid and flexible capital structure and we are targeting approximately $100 million of acquired revenue in 2021. We may exceed this target depending on the timing of acquisitions within our large and growing pipeline.

During the 2020 fourth quarter, IBP completed the following acquisitions:

Fourth Quarter 2020 Results Overview

For the fourth quarter of 2020, net revenue was $441.5 million, an increase of 10.0% from $401.2 million in the fourth quarter of 2019. On a same branch basis, net revenue improved 2.8% from the prior year quarter. Residential same branch sales growth was 5.5% in the quarter, attributable to a higher volume of jobs completed, compared to an increase in total completions of 3.5%. Price/mix was negatively impacted during the quarter as the Company experienced a higher volume of sales to production builders compared to last year. This shift within the single-family end market impacted price/mix as the average insulation selling price for entry level production builder jobs is typically lower than a move-up or custom home builder. Our large commercial construction end-market increased 40.4% for the fourth quarter of 2020, and on a same branch basis grew 6.4%.

2

Gross profit improved 12.4% to $134.9 million from $120.0 million in the prior year quarter. Adjusted gross profit* as a percent of total revenue was 30.6%, compared to 29.9% for the same period last year. Selling and administrative expense, as a percent of net revenue, was 18.5% compared to 19.6% in the prior year quarter. Higher volume provided better administrative expense leverage during the quarter and adjusted selling and administrative expense*, as a percent of net revenue, improved to 17.8% from 18.6% in the prior year quarter.

Net income was $27.8 million, or $0.94 per diluted share, compared to $19.2 million, or $0.64 per diluted share, in the prior year quarter. Adjusted net income* was $36.6 million, or $1.23 per diluted share, compared to $27.6 million, or $0.92 per diluted share in the prior year quarter. Adjusted net income adjusts for the impact of non-core items in both periods, including an addback for non-cash amortization expense related to acquisitions.

Adjusted EBITDA* was $67.1 million, a 20.7% increase from $55.6 million in the prior year quarter, largely due to higher sales, improved gross profit, and leveraging the Company’s administrative expenses. Adjusted EBITDA, as a percent of net revenue, was 15.2% compared to 13.9% in the prior year quarter.

Full Year 2020 Results Overview

For the year ended December 31, 2020, net revenue was $1,653.2 million, an increase of 9.4% from $1,511.6 million in 2019. On a same branch basis, net revenue improved 4.5% from the prior year. Residential same branch sales growth was 4.7% for the year, attributable to price gains and end-market and product mix, compared to an increase in total completions of 2.5%. Our large commercial construction end-market increased 15.3% for 2020, and increased 2.8% on a same branch basis.

Gross profit improved 17.3% to $510.0 million from $434.8 million in the prior year. Gross margin was 30.8% compared to 28.8% in the prior year. Adjusted gross profit* as a percent of total revenue was 30.9%, which adjusts for the Company’s share-based compensation expense and employee-related expenses associated with the COVID-19 pandemic, compared to 28.8% for the same period last year. Selling and administrative expense, as a percentage of net revenue, was 19.3% compared to 19.1% in the prior year. Adjusted selling and administrative expense^*, as a percentage of net revenue was 18.5% compared to 18.4% in the prior year.

Net income was $97.2 million, or $3.27 per diluted share, compared to $68.2 million, or $2.28 per diluted share in the prior year. Adjusted net income* was $128.9 million, or $4.34 per diluted share, compared to $98.3 million, or $3.29 per diluted share in the prior year.

For the full year of 2020, adjusted EBITDA* was $245.6 million, a 24.8% increase from $196.8 million in the prior year. Adjusted EBITDA, as a percentage of net revenue, was 14.9%, compared to 13.0% in the prior year. Operating income was $161.9 million, a 33.6% increase from $121.2 million in the prior year. The incremental adjusted EBITDA margin* on same branch revenue growth was 54.2% (please refer to the Supplementary Tables at the end of this Press Release).

Net cash from operating activities was $180.8 million, an increase of 46.9% from $123.1 million in the prior year.

3

Conference Call and Webcast

The Company will host a conference call and webcast on February 24, 2021 at 10:00 a.m. Eastern Time to discuss these results. To participate in the call, please dial 877-407-0792 (domestic) or 201-689-8263 (international). The live webcast will be available at www.installedbuildingproducts.com in the investor relations section. A replay of the conference call will be available through March 24, 2021, by dialing 844-512-2921 (domestic) or 412-317-6671 (international) and entering the passcode 13714679.

About Installed Building Products

Installed Building Products, Inc. is one of the nation’s largest new residential insulation installers and is a diversified installer of complementary building products, including waterproofing, fire-stopping, fireproofing, garage doors, rain gutters, window blinds, shower doors, closet shelving and mirrors and other products for residential and commercial builders located in the continental United States. The Company manages all aspects of the installation process for its customers, from direct purchase and receipt of materials from national manufacturers to its timely supply of materials to job sites and quality installation. The Company offers its portfolio of services for new and existing single-family and multi-family residential and commercial building projects from its national network of over 190 branch locations.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the federal securities laws, including with respect to the housing market and the commercial market, our financial and business model, payments of a quarterly cash dividend, the possiblity of an annual variable dividend in 2022, our stock repurchase program, the demand for our services and product offerings, the impact of the COVID-19 crisis on our business and end markets, expansion of our national footprint and end markets, diversification of our products, our ability to grow and strengthen our market position, our ability to pursue and integrate value-enhancing acquisitions and the expected amount of acquired revenue, our ability to improve sales and profitability, the impact of the COVID-19 crisis on our financial results, and expectations for demand for our services and our earnings in 2021. Forward-looking statements may generally be identified by the use of words such as “anticipate,” “believe,” “expect,” “intends,” “plan,” and “will” or, in each case, their negative, or other variations or comparable terminology. These forward-looking statements include all matters that are not historical facts. By their nature, forward-looking statements involve risks and uncertainties because they relate to events and depend on circumstances that may or may not occur in the future. Any forward-looking statements that we make herein and in any future reports and statements are not guarantees of future performance, and actual results may differ materially from those expressed in or suggested by such forward-looking statements as a result of various factors, including, without limitation, the duration, effect and severity of the COVID-19 crisis; the adverse impact of the COVID-19 crisis on our business and financial results, the economy and the markets we serve; general economic and industry conditions, the material price environment; the timing of increases in our selling prices; the risk that the Company may reduce, suspend or eliminate dividend payments in the future; and the factors discussed in the “Risk Factors” section of the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, as the same may be updated from time to time in our subsequent filings with the Securities and Exchange Commission. In addition, any future declaration of dividends will be subject to the final determination of our Board of Directors. Any forward-looking statement made by the Company in this press release speaks only as of the date hereof. New risks and uncertainties arise from time to time, and it is impossible for the Company to predict these events or how they may affect it. The Company has no obligation, and does not intend, to update any forward-looking statements after the date hereof, except as required by federal securities laws.

4

*Use of Non-GAAP Financial Measures

In addition to the financial measures prepared in accordance with U.S. generally accepted accounting principles (“GAAP”), this press release contains the non-GAAP financial measures of Adjusted EBITDA, Adjusted EBITDA margin (i.e., Adjusted EBITDA divided by net revenue), Adjusted Net Income, Adjusted Net Income per diluted share, Adjusted Gross Profit and Adjusted Selling and Administrative expense. The reasons for the use of these measures, reconciliations of Adjusted EBITDA, Adjusted Net Income, Adjusted Net Income per diluted share, Adjusted Gross Profit, and Adjusted Selling and Administrative expense to the most directly comparable GAAP measures and other information relating to these measures are included below following the unaudited condensed consolidated financial statements. Non-GAAP financial measures have limitations as analytical tools and should not be considered in isolation or as a substitute for IBP’s financial results prepared in accordance with GAAP.

5

INSTALLED BUILDING PRODUCTS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

(unaudited, in thousands, except share and per share amounts)

6

INSTALLED BUILDING PRODUCTS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited, in thousands, except share and per share amounts)

7

INSTALLED BUILDING PRODUCTS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited, in thousands)

8

Reconciliation of Non-GAAP Financial Measures

Adjusted EBITDA, Adjusted EBITDA margin, Adjusted Net Income, Adjusted Gross Profit and Adjusted Selling and Administrative Expense measure performance by adjusting EBITDA, GAAP net income, gross profit and selling and administrative expense, respectively, for certain income or expense items that are not considered part of our core operations. We believe that the presentation of these measures provides useful information to investors regarding our results of operations because it assists both investors and us in analyzing and benchmarking the performance and value of our business.

We believe the Adjusted EBITDA measure is useful to investors and us as a measure of comparative operating performance from period to period as it measures our changes in pricing decisions, cost controls and other factors that impact operating performance, and removes the effect of our capital structure (primarily interest expense), asset base (primarily depreciation and amortization), items outside our control (primarily income taxes) and the volatility related to the timing and extent of other activities such as asset impairments and non-core income and expenses. Accordingly, we believe that this measure is useful for comparing general operating performance from period to period. In addition, we use various EBITDA-based measures in determining the achievement of awards under certain of our incentive compensation programs. Other companies may define Adjusted EBITDA differently and, as a result, our measure may not be directly comparable to measures of other companies. In addition, Adjusted EBITDA may be defined differently for purposes of covenants contained in our revolving credit facility or any future facility.

Although we use the Adjusted EBITDA measure to assess the performance of our business, the use of the measure is limited because it does not include certain material expenses, such as interest and taxes, necessary to operate our business. Adjusted EBITDA should be considered in addition to, and not as a substitute for, GAAP net income as a measure of performance. Our presentation of this measure should not be construed as an indication that our future results will be unaffected by unusual or non-recurring items. This measure has limitations as an analytical tool, and you should not consider it in isolation or as a substitute for analysis of our results as reported under GAAP. Because of these limitations, this measure is not intended as an alternative to net income as an indicator of our operating performance, as an alternative to any other measure of performance in conformity with GAAP or as an alternative to cash flow provided by operating activities as a measure of liquidity. You should therefore not place undue reliance on this measure or ratios calculated using this measure.

We also believe the Adjusted Net Income measure is useful to investors and us as a measure of comparative operating performance from period to period as it measures our changes in pricing decisions, cost controls and other factors that impact operating performance, and removes the effect of certain non-core items such as discontinued operations, acquisition related expenses, amortization expense, the tax impact of these certain non-core items, and the volatility related to the timing and extent of other activities such as asset impairments and non-core income and expenses. To make the financial presentation more consistent with other public building products companies, beginning in the fourth quarter 2016 we included an addback for non-cash amortization expense related to acquisitions. Accordingly, we believe that this measure is useful for comparing general operating performance from period to period. Other companies may define Adjusted Net Income differently and, as a result, our measure may not be directly comparable to measures of other companies. In addition, Adjusted Net Income may be defined differently for purposes of covenants contained in our revolving credit facility or any future facility.

9

INSTALLED BUILDING PRODUCTS, INC.

RECONCILIATION OF GAAP TO NON-GAAP MEASURES

ADJUSTED NET INCOME CALCULATIONS

(unaudited, in thousands, except share and per share amounts)

The table below reconciles Adjusted Net Income to the most directly comparable GAAP financial measure, net income, for the periods presented therein.

Per share figures may reflect rounding adjustments and consequently totals may not appear to sum.

¹  Addback of employee pay, employee medical expenses, and legal fees directly attributable to COVID-19

²  Addback of costs related to organic branch expansion for Alpha locations

³  Addback of all non-cash amortization resulting from business combinations

⁴  Normalized effective tax rate of 25.9% and 26.4% applied to periods presented for 2020 and 2019, respectively

⁵  Includes adjustments related to the items noted above, net of tax

10

INSTALLED BUILDING PRODUCTS, INC.

RECONCILIATION OF GAAP TO NON-GAAP MEASURES

ADJUSTED GROSS PROFIT CALCULATIONS

(unaudited, in thousands)

¹  Addback of employee pay and employee medical expenses directly attributable to COVID-19

²  Addback of costs related to organic branch expansion for Alpha locations

INSTALLED BUILDING PRODUCTS, INC.

RECONCILIATION OF GAAP TO NON-GAAP MEASURES

ADJUSTED SELLING AND ADMINISTRATIVE EXPENSE CALCULATIONS

(unaudited, in thousands)

¹  Addback of employee pay, employee medical expenses and legal fees directly attributable to COVID-19

11

The table below reconciles Adjusted EBITDA to the most directly comparable GAAP financial measure, net income, for the periods presented therein.

RECONCILIATION OF GAAP TO NON-GAAP MEASURES

ADJUSTED EBITDA CALCULATIONS

(unaudited, in thousands)

¹  Addback of employee pay, employee medical expenses and legal fees directly attributable to COVID-19

INSTALLED BUILDING PRODUCTS, INC.

SUPPLEMENTARY TABLE

(unaudited)

¹  Excludes the large commercial end market

²  U.S. Census Bureau data, as revised

12

INSTALLED BUILDING PRODUCTS, INC.

INCREMENTAL REVENUE AND ADJUSTED EBITDA MARGINS

(unaudited, in thousands)

Source: Installed Building Products, Inc.

Contact Information:

Investor Relations:

614-221-9944

investorrelations@installed.net

13