diff --git a/config/common/errors.go b/config/common/errors.go
index 1961f0074..2729df854 100644
--- a/config/common/errors.go
+++ b/config/common/errors.go
@@ -37,6 +37,8 @@ var (
 	ErrNodeExists             = errors.New("matching filesystem node has existing contents or different type")
 	ErrNoFilesDir             = errors.New("local file paths are relative to a files directory that must be specified with -d/--files-dir")
 	ErrTreeNotDirectory       = errors.New("root of tree must be a directory")
+	ErrRootTooSmall           = errors.New("root should have 8GiB of space available")
+	ErrRootNotLastPartition   = errors.New("root should be last partition number to allow for growth")
 	ErrTreeNoLocal            = errors.New("local is required")
 
 	// filesystem nodes
diff --git a/config/fcos/v1_5_exp/translate.go b/config/fcos/v1_5_exp/translate.go
index f2eec2fd0..b566200a9 100644
--- a/config/fcos/v1_5_exp/translate.go
+++ b/config/fcos/v1_5_exp/translate.go
@@ -68,17 +68,28 @@ func (c Config) ToIgn3_4Unvalidated(options common.TranslateOptions) (types.Conf
 		return types.Config{}, translate.TranslationSet{}, r
 	}
 	r.Merge(c.processBootDevice(&ret, &ts, options))
+
 	for i, disk := range ret.Storage.Disks {
-		// In the boot_device.mirror case, nothing specifies partition numbers
-		// so match existing partitions only when `wipeTable` is false
-		if !util.IsTrue(disk.WipeTable) {
-			for j, partition := range disk.Partitions {
-				// check for reserved partlabels
-				if partition.Label != nil {
+		for p, partition := range disk.Partitions {
+			if partition.Label != nil {
+				if *partition.Label == "root" {
+					if *partition.SizeMiB < 8192 {
+						r.AddOnWarn(path.New("json", "storage", "disks", i, "partitions", p, "sizeMiB", *partition.SizeMiB), common.ErrRootTooSmall)
+					}
+					for _, op := range disk.Partitions {
+						if op.Number > partition.Number {
+							r.AddOnWarn(path.New("json", "storage", "disks", i, "partitions", p, "number", partition.Number), common.ErrRootNotLastPartition)
+						}
+					}
+				}
+				// Don't warn if wipeTable is set, matching later spec versions
+				if !util.IsTrue(disk.WipeTable) {
+					// check for reserved partlabels
 					if (*partition.Label == "BIOS-BOOT" && partition.Number != 1) || (*partition.Label == "PowerPC-PReP-boot" && partition.Number != 1) || (*partition.Label == "EFI-SYSTEM" && partition.Number != 2) || (*partition.Label == "boot" && partition.Number != 3) || (*partition.Label == "root" && partition.Number != 4) {
-						r.AddOnWarn(path.New("json", "storage", "disks", i, "partitions", j, "label"), common.ErrWrongPartitionNumber)
+						r.AddOnWarn(path.New("json", "storage", "disks", i, "partitions", p, "label"), common.ErrWrongPartitionNumber)
 					}
 				}
+
 			}
 		}
 	}
diff --git a/config/fcos/v1_5_exp/translate_test.go b/config/fcos/v1_5_exp/translate_test.go
index fbb3f4798..ad01a011b 100644
--- a/config/fcos/v1_5_exp/translate_test.go
+++ b/config/fcos/v1_5_exp/translate_test.go
@@ -146,6 +146,198 @@ func TestTranslateBootDevice(t *testing.T) {
 				},
 			},
 		},
+		// root partition too small
+		{
+			Config{
+				Config: base.Config{
+					Storage: base.Storage{
+						Disks: []base.Disk{
+							{
+								Device: "/dev/vda",
+								Partitions: []base.Partition{
+									{
+										Label:   util.StrToPtr("root"),
+										SizeMiB: util.IntToPtr(500),
+										Resize:  util.BoolToPtr(true),
+										Number:  4,
+									},
+									{
+										Label:   util.StrToPtr("var-home"),
+										SizeMiB: util.IntToPtr(10240),
+									},
+								},
+							},
+						},
+						Filesystems: []base.Filesystem{
+							{
+								Device:         "/dev/disk/by-partlabel/var-home",
+								Format:         util.StrToPtr("xfs"),
+								Path:           util.StrToPtr("/var/home"),
+								Label:          util.StrToPtr("var-home"),
+								WipeFilesystem: util.BoolToPtr(false),
+							},
+						},
+					},
+				},
+			},
+			types.Config{
+				Ignition: types.Ignition{
+					Version: "3.4.0-experimental",
+				},
+				Storage: types.Storage{
+					Disks: []types.Disk{
+						{
+							Device: "/dev/vda",
+							Partitions: []types.Partition{
+								{
+									Label:   util.StrToPtr("root"),
+									SizeMiB: util.IntToPtr(500),
+									Resize:  util.BoolToPtr(true),
+									Number:  4,
+								},
+								{
+									Label:   util.StrToPtr("var-home"),
+									SizeMiB: util.IntToPtr(10240),
+								},
+							},
+						},
+					},
+					Filesystems: []types.Filesystem{
+						{
+							Device:         "/dev/disk/by-partlabel/var-home",
+							Format:         util.StrToPtr("xfs"),
+							Path:           util.StrToPtr("/var/home"),
+							Label:          util.StrToPtr("var-home"),
+							WipeFilesystem: util.BoolToPtr(false),
+						},
+					},
+				},
+			},
+			[]translate.Translation{
+				{path.New("yaml", "version"), path.New("json", "ignition", "version")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0, "label"), path.New("json", "storage", "disks", 0, "partitions", 0, "label")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0, "size_mib"), path.New("json", "storage", "disks", 0, "partitions", 0, "sizeMiB")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0, "resize"), path.New("json", "storage", "disks", 0, "partitions", 0, "resize")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 1, "label"), path.New("json", "storage", "disks", 0, "partitions", 1, "label")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 1, "size_mib"), path.New("json", "storage", "disks", 0, "partitions", 1, "sizeMiB")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0), path.New("json", "storage", "disks", 0, "partitions", 0)},
+				{path.New("yaml", "storage", "disks", 0), path.New("json", "storage", "disks", 0)},
+				{path.New("yaml", "storage", "filesystems", 0, "device"), path.New("json", "storage", "filesystems", 0, "device")},
+				{path.New("yaml", "storage", "filesystems", 0, "format"), path.New("json", "storage", "filesystems", 0, "format")},
+				{path.New("yaml", "storage", "filesystems", 0, "path"), path.New("json", "storage", "filesystems", 0, "path")},
+				{path.New("yaml", "storage", "filesystems", 0, "label"), path.New("json", "storage", "filesystems", 0, "label")},
+				{path.New("yaml", "storage", "filesystems", 0, "wipe_filesystem"), path.New("json", "storage", "filesystems", 0, "wipeFilesystem")},
+				{path.New("yaml", "storage", "filesystems", 0), path.New("json", "storage", "filesystems", 0)},
+				{path.New("yaml", "storage", "filesystems"), path.New("json", "storage", "filesystems")},
+				{path.New("yaml", "storage"), path.New("json", "storage")},
+			},
+			report.Report{
+				Entries: []report.Entry{
+					{
+						Kind:    report.Warn,
+						Message: common.ErrRootTooSmall.Error(),
+						Context: path.New("json", "storage", "disks", 0, "partitions", 0, "sizeMiB", 500),
+					},
+				},
+			},
+		},
+		// root partition constrained
+		{
+			Config{
+				Config: base.Config{
+					Storage: base.Storage{
+						Disks: []base.Disk{
+							{
+								Device: "/dev/vda",
+								Partitions: []base.Partition{
+									{
+										Label:   util.StrToPtr("root"),
+										SizeMiB: util.IntToPtr(10000),
+										Resize:  util.BoolToPtr(true),
+										Number:  4,
+									},
+									{
+										Label:   util.StrToPtr("var-home"),
+										SizeMiB: util.IntToPtr(10240),
+										Number:  5,
+									},
+								},
+							},
+						},
+						Filesystems: []base.Filesystem{
+							{
+								Device:         "/dev/disk/by-partlabel/var-home",
+								Format:         util.StrToPtr("xfs"),
+								Path:           util.StrToPtr("/var/home"),
+								Label:          util.StrToPtr("var-home"),
+								WipeFilesystem: util.BoolToPtr(false),
+							},
+						},
+					},
+				},
+			},
+			types.Config{
+				Ignition: types.Ignition{
+					Version: "3.4.0-experimental",
+				},
+				Storage: types.Storage{
+					Disks: []types.Disk{
+						{
+							Device: "/dev/vda",
+							Partitions: []types.Partition{
+								{
+									Label:   util.StrToPtr("root"),
+									SizeMiB: util.IntToPtr(10000),
+									Resize:  util.BoolToPtr(true),
+									Number:  4,
+								},
+								{
+									Label:   util.StrToPtr("var-home"),
+									SizeMiB: util.IntToPtr(10240),
+									Number:  5,
+								},
+							},
+						},
+					},
+					Filesystems: []types.Filesystem{
+						{
+							Device:         "/dev/disk/by-partlabel/var-home",
+							Format:         util.StrToPtr("xfs"),
+							Path:           util.StrToPtr("/var/home"),
+							Label:          util.StrToPtr("var-home"),
+							WipeFilesystem: util.BoolToPtr(false),
+						},
+					},
+				},
+			},
+			[]translate.Translation{
+				{path.New("yaml", "version"), path.New("json", "ignition", "version")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0, "label"), path.New("json", "storage", "disks", 0, "partitions", 0, "label")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0, "size_mib"), path.New("json", "storage", "disks", 0, "partitions", 0, "sizeMiB")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0, "resize"), path.New("json", "storage", "disks", 0, "partitions", 0, "resize")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 1, "label"), path.New("json", "storage", "disks", 0, "partitions", 1, "label")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 1, "size_mib"), path.New("json", "storage", "disks", 0, "partitions", 1, "sizeMiB")},
+				{path.New("yaml", "storage", "disks", 0, "partitions", 0), path.New("json", "storage", "disks", 0, "partitions", 0)},
+				{path.New("yaml", "storage", "disks", 0), path.New("json", "storage", "disks", 0)},
+				{path.New("yaml", "storage", "filesystems", 0, "device"), path.New("json", "storage", "filesystems", 0, "device")},
+				{path.New("yaml", "storage", "filesystems", 0, "format"), path.New("json", "storage", "filesystems", 0, "format")},
+				{path.New("yaml", "storage", "filesystems", 0, "path"), path.New("json", "storage", "filesystems", 0, "path")},
+				{path.New("yaml", "storage", "filesystems", 0, "label"), path.New("json", "storage", "filesystems", 0, "label")},
+				{path.New("yaml", "storage", "filesystems", 0, "wipe_filesystem"), path.New("json", "storage", "filesystems", 0, "wipeFilesystem")},
+				{path.New("yaml", "storage", "filesystems", 0), path.New("json", "storage", "filesystems", 0)},
+				{path.New("yaml", "storage", "filesystems"), path.New("json", "storage", "filesystems")},
+				{path.New("yaml", "storage"), path.New("json", "storage")},
+			},
+			report.Report{
+				Entries: []report.Entry{
+					{
+						Kind:    report.Warn,
+						Message: common.ErrRootNotLastPartition.Error(),
+						Context: path.New("json", "storage", "disks", 0, "partitions", 0, "number", 4),
+					},
+				},
+			},
+		},
 		// LUKS, x86_64
 		{
 			Config{
diff --git a/docs/release-notes.md b/docs/release-notes.md
index 3251467ee..cbe2c4331 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -17,7 +17,8 @@ nav_order: 9
 
 
 ### Misc. changes
-
+- Warn on root size is too small _(fcos)_
+- Warn on root constrained by another partition _(fcos)_
 
 ### Docs changes